feat: Add cht language support.

add CRLF to LF in Dockerfile.

.gitattributes

@@ -0,0 +1,8 @@
+# Normalize line endings to avoid CRLF issues in Linux containers
+* text=auto
+
+# Shell scripts must be LF for correct shebang parsing
+*.sh text eol=lf
+
+# PowerShell scripts are typically CRLF on Windows
+*.ps1 text eol=crlf

Dockerfile

@@ -6,9 +6,13 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 WORKDIR /app
 
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends build-essential \
+    && apt-get install -y --no-install-recommends build-essential tzdata \
     && rm -rf /var/lib/apt/lists/*
 
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN sed -i 's/\r$//' /usr/local/bin/docker-entrypoint.sh \
+    && chmod +x /usr/local/bin/docker-entrypoint.sh
+
 COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
@@ -17,4 +21,6 @@ COPY frontend ./frontend
 
 EXPOSE 8080
 
+ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
+
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080"]

README.md

@@ -26,6 +26,22 @@ PlexPlaylistSync 是一个用于同步 Plex 播放列表和本地 `.m3u`/`.m3u8`
 docker compose up --build
 ```
 
+### 配置容器时区
+
+本项目支持通过 `docker-compose.yml` 的环境变量 `TZ` 配置容器运行时区（需要使用有效的 IANA 时区名，例如 `Asia/Shanghai`、`UTC`、`America/New_York`）。
+
+- 临时指定（当前终端会话生效）：
+
+```bash
+TZ=UTC docker compose up --build
+```
+
+- 或在项目根目录创建 `.env`：
+
+```env
+TZ=Asia/Shanghai
+```
+
 - 默认会以 `--reload` 模式启动，监听本地 8080 端口，可在浏览器访问 `http://localhost:8080`。
 - 通过 `./app/config.json` 保存的 Plex 配置信息会在主机和容器间共享，便于调试时保留登录 token 等数据。
 - 如需自定义端口或其他参数，可在 `docker-compose.yml` 中调整。

app/config.json

@@ -2,12 +2,12 @@
     "theme": "auto",
     "token": "",
     "server_url": "",
-    "server_scheme": "https",
+    "server_scheme": "http",
     "server_port": "32400",
     "timeout": 9,
     "library_name": "",
-    "sync_mode": "merge_local_primary",
-    "local_path": "playlist",
+    "sync_mode": "local_force",
+    "local_path": "playlists",
     "path_rules": [],
     "path_mapping": {
         "mode": "SIMPLE",
@@ -21,8 +21,8 @@
     },
     "schedule_mode": "DISABLED",
     "schedule_cron": "",
-    "schedule_daily_time": "02:00",
+    "schedule_daily_time": "00:00",
     "schedule_weekly_days": [0],
-    "schedule_weekly_time": "03:00",
+    "schedule_weekly_time": "00:00",
     "schedule_auto_watch": false
 }

app/main.py

@@ -144,6 +144,30 @@ class ScheduleSettings(BaseModel):
     autoWatch: bool
 
 
+class BackupSettingsPayload(BaseModel):
+    enabled: bool
+    retention_count: int
+
+
+@app.get("/api/backup/settings")
+async def get_backup_settings():
+    server_config.load()
+    return {
+        "enabled": server_config.backup_enabled,
+        "retention_count": server_config.backup_retention_count
+    }
+
+
+@app.put("/api/backup/settings")
+async def save_backup_settings(settings: BackupSettingsPayload):
+    server_config.set_backup(
+        enabled=settings.enabled,
+        retention_count=settings.retention_count
+    )
+    logger.info(f"Backup settings updated. Enabled: {settings.enabled}, Retention: {settings.retention_count}")
+    return {"status": "success", "message": "Backup settings saved"}
+
+
 @app.get("/api/schedule")
 async def get_schedule():
     next_run = get_next_run_time()

app/utils/backup.py

@@ -0,0 +1,270 @@
+import os
+import zipfile
+from datetime import datetime
+from typing import List
+from app.utils.logger import logger
+from app.utils.config import server_config
+from app.utils.local_playlist import load_local_playlist
+from app.utils.plex_client import plex_client
+
+# Default backup directory
+BACKUP_DIR = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), "..", "..", "backups")
+)
+
+
+def ensure_backup_dir():
+    """Ensure the backup directory exists."""
+    if not os.path.exists(BACKUP_DIR):
+        os.makedirs(BACKUP_DIR, exist_ok=True)
+        logger.info(f"Created backup directory: {BACKUP_DIR}")
+
+
+def get_timestamp() -> str:
+    """Generate a timestamp string for backup filenames."""
+    return datetime.now().strftime("%Y%m%d_%H%M%S")
+
+
+def get_sorted_backup_files(prefix: str) -> List[str]:
+    """Get backup files sorted by modification time (oldest first).
+    
+    Args:
+        prefix: The prefix to filter backup files (e.g., 'local_backup_' or 'cloud_backup_')
+    
+    Returns:
+        List of backup file paths sorted by modification time (oldest first)
+    """
+    ensure_backup_dir()
+    backup_files = []
+    for filename in os.listdir(BACKUP_DIR):
+        if filename.startswith(prefix) and filename.endswith('.zip'):
+            filepath = os.path.join(BACKUP_DIR, filename)
+            backup_files.append(filepath)
+    
+    # Sort by modification time (oldest first)
+    backup_files.sort(key=lambda x: os.path.getmtime(x))
+    return backup_files
+
+
+def cleanup_old_backups(prefix: str, retention_count: int):
+    """Delete old backup files exceeding the retention count.
+    
+    Args:
+        prefix: The prefix to filter backup files (e.g., 'local_backup_' or 'cloud_backup_')
+        retention_count: Maximum number of backups to keep (0 means no auto-delete)
+    """
+    if retention_count <= 0:
+        logger.debug(f"Backup retention count is {retention_count}, skipping cleanup for {prefix}")
+        return
+    
+    backup_files = get_sorted_backup_files(prefix)
+    
+    # Delete oldest files if we exceed retention count
+    files_to_delete = len(backup_files) - retention_count
+    if files_to_delete > 0:
+        for filepath in backup_files[:files_to_delete]:
+            try:
+                os.remove(filepath)
+                logger.info(f"Deleted old backup: {filepath}")
+            except Exception as e:
+                logger.warning(f"Failed to delete backup {filepath}: {e}")
+
+
+def backup_local_playlists(local_path: str) -> str | None:
+    """Create a backup of local playlists.
+    
+    Reads all playlist files from the local path and writes them to a zip file
+    without any modifications.
+    
+    Args:
+        local_path: Path to the local playlist directory
+    
+    Returns:
+        Path to the created backup file, or None if backup failed
+    """
+    ensure_backup_dir()
+    
+    if not local_path or not os.path.isdir(local_path):
+        logger.warning(f"Local path does not exist or is not a directory: {local_path}")
+        return None
+    
+    timestamp = get_timestamp()
+    backup_filename = f"local_backup_{timestamp}.zip"
+    backup_path = os.path.join(BACKUP_DIR, backup_filename)
+    
+    try:
+        playlist_count = 0
+        with zipfile.ZipFile(backup_path, 'w', zipfile.ZIP_DEFLATED) as zipf:
+            for entry in os.scandir(local_path):
+                if not entry.is_file():
+                    continue
+                if not entry.name.lower().endswith((".m3u", ".m3u8")):
+                    continue
+                
+                # Read the original file content
+                try:
+                    with open(entry.path, 'r', encoding='utf-8') as f:
+                        content = f.read()
+                except UnicodeDecodeError:
+                    # Try with different encoding
+                    with open(entry.path, 'r', encoding='latin-1') as f:
+                        content = f.read()
+                
+                # Get the playlist name without extension and add .m3u8 extension
+                playlist_name = os.path.splitext(entry.name)[0]
+                archive_name = f"{playlist_name}.m3u8"
+                
+                # Write to zip
+                zipf.writestr(archive_name, content)
+                playlist_count += 1
+        
+        if playlist_count == 0:
+            # Remove empty zip file
+            os.remove(backup_path)
+            logger.info("No playlists found for local backup")
+            return None
+        
+        logger.info(f"Created local backup with {playlist_count} playlists: {backup_path}")
+        return backup_path
+    
+    except Exception as e:
+        logger.error(f"Failed to create local backup: {e}")
+        # Clean up partial backup file if it exists
+        if os.path.exists(backup_path):
+            try:
+                os.remove(backup_path)
+            except OSError:
+                pass
+        return None
+
+
+def backup_cloud_playlists(library_name: str) -> str | None:
+    """Create a backup of cloud playlists.
+    
+    Fetches all playlists from the Plex server and writes them to a zip file
+    without any modifications.
+    
+    Args:
+        library_name: Name of the Plex library to backup playlists from
+    
+    Returns:
+        Path to the created backup file, or None if backup failed
+    """
+    ensure_backup_dir()
+    
+    if not plex_client.connected:
+        logger.warning("Plex client not connected, cannot backup cloud playlists")
+        return None
+    
+    if not library_name:
+        logger.warning("No library name specified for cloud backup")
+        return None
+    
+    timestamp = get_timestamp()
+    backup_filename = f"cloud_backup_{timestamp}.zip"
+    backup_path = os.path.join(BACKUP_DIR, backup_filename)
+    
+    try:
+        playlists = plex_client.get_lib_playlists(library_name)
+        if not playlists:
+            logger.info("No playlists found for cloud backup")
+            return None
+        
+        playlist_count = 0
+        with zipfile.ZipFile(backup_path, 'w', zipfile.ZIP_DEFLATED) as zipf:
+            for playlist in playlists:
+                try:
+                    # Get playlist items
+                    items = playlist.items()
+                    
+                    # Build m3u8 content
+                    lines = ["#EXTM3U"]
+                    for item in items:
+                        # Try to get file path from the track
+                        try:
+                            if hasattr(item, 'media') and item.media:
+                                for media in item.media:
+                                    if hasattr(media, 'parts') and media.parts:
+                                        for part in media.parts:
+                                            if hasattr(part, 'file') and part.file:
+                                                # Add extended info if available
+                                                duration = getattr(item, 'duration', 0) or 0
+                                                duration_seconds = duration // 1000 if duration else -1
+                                                title = getattr(item, 'title', 'Unknown')
+                                                artist = ''
+                                                if hasattr(item, 'grandparentTitle'):
+                                                    artist = item.grandparentTitle
+                                                elif hasattr(item, 'artist'):
+                                                    artist_attr = getattr(item, 'artist')
+                                                    if callable(artist_attr):
+                                                        artist = str(artist_attr())
+                                                    else:
+                                                        artist = str(artist_attr)
+                                                
+                                                extinf = f"#EXTINF:{duration_seconds},{artist} - {title}"
+                                                lines.append(extinf)
+                                                lines.append(part.file)
+                                                break
+                        except Exception as e:
+                            logger.debug(f"Could not get file path for track: {e}")
+                            continue
+                    
+                    if len(lines) > 1:  # More than just #EXTM3U
+                        content = "\n".join(lines)
+                        archive_name = f"{playlist.title}.m3u8"
+                        zipf.writestr(archive_name, content)
+                        playlist_count += 1
+                        
+                except Exception as e:
+                    logger.warning(f"Failed to backup playlist '{playlist.title}': {e}")
+                    continue
+        
+        if playlist_count == 0:
+            # Remove empty zip file
+            os.remove(backup_path)
+            logger.info("No playlists with valid tracks found for cloud backup")
+            return None
+        
+        logger.info(f"Created cloud backup with {playlist_count} playlists: {backup_path}")
+        return backup_path
+    
+    except Exception as e:
+        logger.error(f"Failed to create cloud backup: {e}")
+        # Clean up partial backup file if it exists
+        if os.path.exists(backup_path):
+            try:
+                os.remove(backup_path)
+            except OSError:
+                pass
+        return None
+
+
+def perform_backup_before_sync(local_path: str, library_name: str):
+    """Perform backup of both local and cloud playlists before sync.
+    
+    This function should be called before sync if backup is enabled.
+    It also handles cleanup of old backups based on retention settings.
+    
+    Args:
+        local_path: Path to the local playlist directory
+        library_name: Name of the Plex library
+    """
+    server_config.load()
+    
+    if not server_config.backup_enabled:
+        logger.debug("Backup is disabled, skipping pre-sync backup")
+        return
+    
+    logger.info("Starting pre-sync backup...")
+    
+    # Backup local playlists
+    local_backup = backup_local_playlists(local_path)
+    if local_backup:
+        cleanup_old_backups("local_backup_", server_config.backup_retention_count)
+    
+    # Backup cloud playlists
+    cloud_backup = backup_cloud_playlists(library_name)
+    if cloud_backup:
+        cleanup_old_backups("cloud_backup_", server_config.backup_retention_count)
+    
+    logger.info("Pre-sync backup completed")

app/utils/config.py

@@ -39,6 +39,8 @@ class ServerConfig:
         self.schedule_weekly_days = [0]
         self.schedule_weekly_time = "03:00"
         self.schedule_auto_watch = False
+        self.backup_enabled = False
+        self.backup_retention_count = 5
         self.load()
 
     def load(self) -> None:
@@ -89,6 +91,8 @@ class ServerConfig:
         self.schedule_weekly_days = config.get("schedule_weekly_days", [0])
         self.schedule_weekly_time = config.get("schedule_weekly_time", "03:00")
         self.schedule_auto_watch = config.get("schedule_auto_watch", False)
+        self.backup_enabled = config.get("backup_enabled", False)
+        self.backup_retention_count = config.get("backup_retention_count", 5)
         logger.info(f"Server config loaded.")
         logger.debug(f"Current server config: {self.__dict__}")
 
@@ -111,10 +115,13 @@ class ServerConfig:
             "schedule_weekly_days": self.schedule_weekly_days,
             "schedule_weekly_time": self.schedule_weekly_time,
             "schedule_auto_watch": self.schedule_auto_watch,
+            "backup_enabled": self.backup_enabled,
+            "backup_retention_count": self.backup_retention_count,
         }
         with open(CONFIG_PATH, "w", encoding="utf-8") as f:
             json.dump(config, f, indent=4, ensure_ascii=False)
-        logger.info(f"Server config saved: {config}")
+        logger.info(f"Server config saved.")
+        logger.debug(f"Saved server config: {config}")
 
     def set_url(self, url: str) -> None:
         self.url = url
@@ -182,6 +189,15 @@ class ServerConfig:
         self.schedule_auto_watch = auto_watch
         self.save()
 
+    def set_backup(
+        self,
+        enabled: bool,
+        retention_count: int,
+    ) -> None:
+        self.backup_enabled = enabled
+        self.backup_retention_count = retention_count
+        self.save()
+
     def set_and_save_config(
         self,
         theme: str = None,

app/utils/local_playlist.py

@@ -65,4 +65,48 @@ def scan_local_playlists(base_path: str) -> list[dict]:
 
     playlists.sort(key=lambda item: item["name"].lower())
     logger.info(f"Found {len(playlists)} playlists under {absolute_path}.")
-    return playlists
+    return playlists
+def write_local_playlist(playlist_path: str, tracks: List[str]) -> bool:
+    """
+    Write a list of tracks to a local playlist file.
+
+    Args:
+        playlist_path (str): The path to the playlist file.
+        tracks (list): A list of songs to write to the playlist.
+
+    Returns:
+        bool: True if successful, False otherwise.
+    """
+    try:
+        with open(playlist_path, 'w', encoding="utf-8") as file:
+            file.write("#EXTM3U\n")
+            for track in tracks:
+                file.write(f"{track}\n")
+        logger.info(f"Written {len(tracks)} songs to the playlist: {playlist_path}")
+        return True
+    except Exception as e:
+        logger.error(f"An error occurred while writing the playlist {playlist_path}: {e}")
+        return False
+
+
+def delete_local_playlist(playlist_path: str) -> bool:
+    """
+    Delete a local playlist file.
+
+    Args:
+        playlist_path (str): The path to the playlist file.
+
+    Returns:
+        bool: True if successful, False otherwise.
+    """
+    try:
+        if os.path.exists(playlist_path):
+            os.remove(playlist_path)
+            logger.info(f"Deleted playlist: {playlist_path}")
+            return True
+        else:
+            logger.warning(f"Playlist not found for deletion: {playlist_path}")
+            return False
+    except Exception as e:
+        logger.error(f"An error occurred while deleting the playlist {playlist_path}: {e}")
+        return False

app/utils/plex_client.py

@@ -311,4 +311,94 @@ class PlexClient:
         )
         return local_2_plex
 
+    def get_playlist(self, title: str):
+        """Get a playlist by title."""
+        self._connect_check()
+        try:
+            # Exact match search for playlist
+            playlists = self.server.playlists(title=title)
+            if playlists:
+                return playlists[0]
+            return None
+        except Exception as e:
+            logger.error(f"Error fetching playlist {title}: {e}")
+            return None
+
+    def create_playlist(self, title: str, items: list):
+        """Create a new playlist with the given items."""
+        self._connect_check()
+        try:
+            self.server.createPlaylist(title, items=items)
+            logger.info(f"Created playlist {title} with {len(items)} items.")
+            return True
+        except Exception as e:
+            logger.error(f"Error creating playlist {title}: {e}")
+            return False
+
+    def delete_playlist(self, title: str):
+        """Delete a playlist by title."""
+        self._connect_check()
+        try:
+            playlist = self.get_playlist(title)
+            if playlist:
+                playlist.delete()
+                logger.info(f"Deleted playlist {title}.")
+                return True
+            else:
+                logger.warning(f"Playlist {title} not found for deletion.")
+                return False
+        except Exception as e:
+            logger.error(f"Error deleting playlist {title}: {e}")
+            return False
+
+    def update_playlist(self, title: str, items: list):
+        """
+        Update a playlist with a new list of items.
+        This implementation replaces the existing items with the new ones.
+        """
+        self._connect_check()
+        try:
+            playlist = self.get_playlist(title)
+            if not playlist:
+                return self.create_playlist(title, items)
+            
+            # Remove all items and add new ones
+            playlist.removeItems(playlist.items())
+            if items:
+                playlist.addItems(items)
+            logger.info(f"Updated playlist {title} with {len(items)} items.")
+            return True
+        except Exception as e:
+            logger.error(f"Error updating playlist {title}: {e}")
+            return False
+
+    def get_items_by_paths(self, library_name: str, paths: list[str]) -> list:
+        """
+        Find Plex items (tracks) by their file paths.
+        """
+        self._connect_check()
+        if not paths:
+            return []
+
+        try:
+            path_map = self.match_tracks(library_name, paths)
+        except FileNotFoundError:
+            logger.info(f"Cache not found for {library_name}, creating it...")
+            self.cache_lib_tracks(library_name)
+            path_map = self.match_tracks(library_name, paths)
+
+        items = []
+        for path in paths:
+            rating_key = path_map.get(path)
+            if rating_key and rating_key != UNMATCHED_TRACK_RATING_KEY:
+                try:
+                    item = self.server.fetchItem(rating_key)
+                    items.append(item)
+                except Exception as e:
+                    logger.warning(f"Failed to fetch item for ratingKey {rating_key}: {e}")
+            else:
+                logger.warning(f"Track not found in Plex library (or unmatched): {path}")
+        
+        return items
+
 plex_client = PlexClient()

app/utils/scheduler.py

@@ -143,7 +143,7 @@ def update_scheduler_job():
         trigger = _create_weekly_trigger(server_config.schedule_weekly_days, server_config.schedule_weekly_time)
 
     if trigger:
-        scheduler.add_job(job_function, trigger)
+        scheduler.add_job(job_function, trigger, misfire_grace_time=60, coalesce=True)
         logger.info(f"Added scheduled job with mode '{mode}' and trigger: {trigger}")
     else:
         logger.warning(f"Failed to create trigger for mode '{mode}'. No job added.")

app/utils/sync_manager.py

@@ -1,10 +1,14 @@
 import threading
 import asyncio
 import json
+import os
 from datetime import datetime
 from app.utils.logger import logger
 from app.utils.playlist_merge import sync_all_playlists, SyncMode
 from app.utils.config import server_config
+from app.utils.backup import perform_backup_before_sync
+from app.utils.local_playlist import load_local_playlist, write_local_playlist, delete_local_playlist
+from app.utils.plex_client import plex_client
 
 class SyncManager:
     def __init__(self):
@@ -110,8 +114,58 @@ class SyncManager:
         if sync_kwargs:
             kwargs.update(sync_kwargs)
 
+        # Perform backup before sync if enabled
+        local_dir = kwargs.get("local_dir", server_config.local_path)
+        perform_backup_before_sync(local_dir, server_config.library_name)
+
         # Execute sync
-        return sync_all_playlists(**kwargs)
+        results = sync_all_playlists(**kwargs)
+        
+        # Apply results (write to local and remote)
+        self._apply_sync_results(results)
+        
+        return results
+
+    def _apply_sync_results(self, results):
+        logger.info("Applying sync results to local and remote...")
+        for result in results:
+            playlist_name = result.name
+            action = result.action
+            output_dir = result.output_dir
+            
+            try:
+                if action == "synced":
+                    # 1. Write Local
+                    local_result_path = os.path.join(output_dir, "local_result.m3u8")
+                    if os.path.exists(local_result_path):
+                        tracks = load_local_playlist(local_result_path)
+                        dest_path = os.path.join(server_config.local_path, f"{playlist_name}.m3u8")
+                        # Ensure directory exists
+                        os.makedirs(os.path.dirname(dest_path), exist_ok=True)
+                        write_local_playlist(dest_path, tracks)
+                    
+                    # 2. Write Remote (Plex)
+                    remote_result_path = os.path.join(output_dir, "remote_result.m3u8")
+                    if os.path.exists(remote_result_path):
+                        tracks = load_local_playlist(remote_result_path)
+                        if server_config.library_name:
+                            items = plex_client.get_items_by_paths(server_config.library_name, tracks)
+                            plex_client.update_playlist(playlist_name, items)
+                        else:
+                            logger.warning("Library name not configured, skipping Plex update.")
+
+                elif action == "deleted":
+                    # Delete Local
+                    dest_path = os.path.join(server_config.local_path, f"{playlist_name}.m3u8")
+                    delete_local_playlist(dest_path)
+                    # Also check for .m3u
+                    dest_path_m3u = os.path.join(server_config.local_path, f"{playlist_name}.m3u")
+                    delete_local_playlist(dest_path_m3u)
+                    
+                    # Delete Remote
+                    plex_client.delete_playlist(playlist_name)
+            except Exception as e:
+                logger.error(f"Error applying sync result for playlist {playlist_name}: {e}")
 
     def _complete_sync(self, status, error=None):
         with self._lock:

docker-compose.yml

@@ -5,9 +5,11 @@ services:
     ports:
       - "8888:8080"
     volumes:
-      - path_to_your_playlist:/app/playlist
+      - PATH_TO_YOUR_PLAYLISTS:/app/playlists
+      - PATH_TO_YOUR_BACKUP:/app/backup
     environment:
       - PYTHONUNBUFFERED=1
       - PYTHONDONTWRITEBYTECODE=1
       - LOG_LEVEL=INFO
+      - TZ=${TZ:-Asia/Tokyo}
     restart: unless-stopped

docker-entrypoint.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+set -eu
+
+# Configure timezone inside the container if TZ is provided.
+# This avoids relying on host mounts like /etc/localtime, which are awkward on Windows.
+if [ "${TZ:-}" != "" ]; then
+  ZONEINFO="/usr/share/zoneinfo/${TZ}"
+  if [ -e "$ZONEINFO" ]; then
+    ln -snf "$ZONEINFO" /etc/localtime
+    echo "$TZ" > /etc/timezone
+  else
+    echo "[entrypoint] Warning: TZ='$TZ' not found at $ZONEINFO; keeping existing timezone." >&2
+  fi
+fi
+
+exec "$@"

frontend/App.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useState, useCallback, useRef } from 'react';
-import { Playlist, ServerType, SyncStrategy, PlexServerConnection, PathMappingConfig, PathMappingMode, PlexConnectionSettings, SyncState, ScheduleSettings, ScheduleMode } from './types';
+import { Playlist, ServerType, SyncStrategy, PlexServerConnection, PathMappingConfig, PathMappingMode, PlexConnectionSettings, SyncState, ScheduleSettings, ScheduleMode, BackupSettings } from './types';
 import { apiService } from './services/api';
 import { 
   STRIPE_BASE_SPEED,
@@ -15,7 +15,9 @@ import { SYNC_BANNER_PADDING_X, SYNC_BANNER_PADDING_Y, SYNC_BANNER_MIN_WIDTH } f
 import ServerPanel from './components/ServerPanel';
 import StrategySelector from './components/StrategySelector';
 import ConnectionModal from './components/ConnectionModal';
-import { ArrowLeftRight, ShieldCheck, X, Server, ServerOff, Clock, Eye, EyeOff, Type, Code2 } from 'lucide-react';
+import OverflowMarquee from './components/OverflowMarquee';
+import { ArrowLeftRight, ShieldCheck, X, Server, ServerOff, Clock, Eye, EyeOff, Type, Code2, Archive, Languages } from 'lucide-react';
+import { useLanguage } from './LanguageContext';
 
 interface Toast {
   id: number;
@@ -112,6 +114,7 @@ const useStripeAnimation = (syncState: SyncState) => {
 };
 
 const App: React.FC = () => {
+  const { t, language, setLanguage } = useLanguage();
   const [localPlaylists, setLocalPlaylists] = useState<Playlist[]>([]);
   const [cloudPlaylists, setCloudPlaylists] = useState<Playlist[]>([]);
   const [cloudServerInfo, setCloudServerInfo] = useState<PlexServerConnection | undefined>(undefined);
@@ -134,6 +137,7 @@ const App: React.FC = () => {
 
   // Connection Modal State
   const [isConnectionModalOpen, setIsConnectionModalOpen] = useState(false);
+  const [isLangMenuOpen, setIsLangMenuOpen] = useState(false);
 
   // Strategy State
   const [currentStrategy, setCurrentStrategy] = useState<SyncStrategy>(SyncStrategy.LOCAL_OVERWRITE);
@@ -161,6 +165,12 @@ const App: React.FC = () => {
   });
   const [nextRunTime, setNextRunTime] = useState<string | undefined>(undefined);
 
+  // Backup State
+  const [backupSettings, setBackupSettings] = useState<BackupSettings>({
+    enabled: false,
+    retentionCount: 5
+  });
+
   // Toast Notification System
   const [toasts, setToasts] = useState<Toast[]>([]);
   const timeoutsRef = useRef<{[key: number]: ReturnType<typeof setTimeout>}>({});
@@ -246,6 +256,13 @@ const App: React.FC = () => {
     }
   }, []);
 
+  const loadBackupSettings = useCallback(async () => {
+    const result = await apiService.getBackupSettings();
+    if (result.status === 'success') {
+      setBackupSettings(result.data);
+    }
+  }, []);
+
   // Handle Schedule Save
   const handleSaveSchedule = async (settings: ScheduleSettings): Promise<boolean> => {
     const result = await apiService.saveScheduleSettings(settings);
@@ -256,17 +273,30 @@ const App: React.FC = () => {
        loadSchedule();
 
        if (settings.mode === ScheduleMode.DISABLED) {
-          addToast("Scheduled tasks disabled.");
+         addToast(t('toasts.scheduleDisabled'));
+       } else if (settings.mode === ScheduleMode.CRON && settings.cronExpression.trim() === '') {
+         addToast(t('toasts.scheduleEmpty'));
        } else {
-          addToast("Scheduled task updated successfully.");
+         addToast(t('toasts.scheduleStarted'));
        }
        return true;
     } else {
-       addToast(result.message || "Failed to update schedule.");
+       addToast(result.message || t('toasts.scheduleFailed'));
        return false;
     }
   };
 
+  // Handle Backup Settings Save
+  const handleSaveBackupSettings = async (settings: BackupSettings) => {
+    const result = await apiService.saveBackupSettings(settings);
+    if (result.status === 'success') {
+      setBackupSettings(settings);
+      addToast(t('toasts.backupSaved'));
+    } else {
+      addToast(result.message || t('toasts.backupFailed'));
+    }
+  };
+
   // Fetch Local Playlists
   const refreshLocal = useCallback(async () => {
     if (localAbortRef.current) localAbortRef.current.abort();
@@ -287,7 +317,7 @@ const App: React.FC = () => {
       localAbortRef.current.abort();
       localAbortRef.current = null;
       setLoadingLocal(false);
-      addToast("Local refresh cancelled.");
+      addToast(t('toasts.localRefreshCancelled'));
     }
   };
 
@@ -321,7 +351,7 @@ const App: React.FC = () => {
       cloudAbortRef.current.abort();
       cloudAbortRef.current = null;
       setLoadingCloud(false);
-      addToast("Cloud refresh cancelled.");
+      addToast(t('toasts.cloudRefreshCancelled'));
     }
   };
 
@@ -329,7 +359,8 @@ const App: React.FC = () => {
   useEffect(() => {
     loadSettings();
     loadSchedule();
-  }, [loadSettings, loadSchedule]);
+    loadBackupSettings();
+  }, [loadSettings, loadSchedule, loadBackupSettings]);
 
   // Initial Load
   useEffect(() => {
@@ -347,9 +378,9 @@ const App: React.FC = () => {
     setCurrentStrategy(strategy);
     const result = await apiService.updateSyncStrategy(strategy);
     if (result.status === 'success') {
-      addToast(`Selected strategy "${label}" has been saved.`);
+      addToast(t('toasts.strategySaved', { strategy: label }));
     } else {
-      addToast(result.message || 'Failed to save sync strategy.');
+      addToast(result.message || t('toasts.strategySaveFailed'));
     }
   };
 
@@ -358,9 +389,9 @@ const App: React.FC = () => {
     setPathMappingConfig(config);
     const result = await apiService.savePathMapping(config);
     if (result.status === 'success') {
-      addToast('Path mapping rules have been saved.');
+      addToast(t('toasts.mappingSaved'));
     } else {
-      addToast(result.message || 'Failed to save path mapping rules.');
+      addToast(result.message || t('toasts.mappingSaveFailed'));
     }
   };
 
@@ -385,7 +416,7 @@ const App: React.FC = () => {
       }, SYNC_SUCCESS_TOTAL_MS);
     } else {
       setSyncState(SyncState.ERROR);
-      addToast(result.message || 'Sync failed. Please check connection.');
+      addToast(result.message || t('toasts.syncFailed'));
       setTimeout(() => setSyncState(SyncState.IDLE), SYNC_ERROR_RESET_MS);
     }
   };
@@ -432,11 +463,11 @@ const App: React.FC = () => {
                 setSyncState(SyncState.SUCCESS);
                 refreshLocal();
                 refreshCloud();
-                addToast("Background sync completed successfully.");
+               addToast(t('toasts.backgroundSyncSuccess'));
                 setTimeout(() => setSyncState(SyncState.IDLE), SYNC_SUCCESS_TOTAL_MS);
              } else if (status === 'error') {
                 setSyncState(SyncState.ERROR);
-                addToast(`Background sync failed: ${error}`);
+               addToast(t('toasts.backgroundSyncFailed', { error: error || '' }));
                 setTimeout(() => setSyncState(SyncState.IDLE), SYNC_ERROR_RESET_MS);
              }
           } else {
@@ -493,26 +524,24 @@ const App: React.FC = () => {
   const isConnected = cloudServerInfo?.isConnected;
 
   const getScheduleDisplayInfo = () => {
-    const result = { 
-        label: 'Schedule', 
-        value: 'Not configured', 
-        active: false,
-        autoWatch: scheduleSettings.autoWatch 
+    const result = {
+      label: t('dashboard.autoSync'),
+      value: t('schedule.notConfigured'),
+      active: false,
+      autoWatch: scheduleSettings.autoWatch,
     };
 
     if (scheduleSettings.mode === ScheduleMode.DISABLED) {
-      result.label = 'Auto-Sync';
-      result.value = 'Disabled';
+      result.value = t('common.disabled');
       return result;
     }
-    
-    let label = 'Schedule';
-    if (scheduleSettings.mode === ScheduleMode.CRON) label = 'Cron Schedule';
-    else if (scheduleSettings.mode === ScheduleMode.DAILY) label = 'Daily Schedule';
-    else if (scheduleSettings.mode === ScheduleMode.WEEKLY) label = 'Weekly Schedule';
 
-    result.label = label;
-    result.value = nextRunTime ? `Next: ${nextRunTime}` : 'Calculating...';
+    if (scheduleSettings.mode === ScheduleMode.CRON && scheduleSettings.cronExpression.trim() === '') {
+      result.value = t('dashboard.notSet');
+    } else {
+      result.value = nextRunTime ? `${nextRunTime}` : t('common.loading');
+    }
+
     result.active = true;
     return result;
   };
@@ -522,41 +551,59 @@ const App: React.FC = () => {
   // Helper: Calculate Path Mapping Info
   const getPathMappingDisplayInfo = (config: PathMappingConfig) => {
     let count = 0;
-    let modeLabel = '';
     let Icon = Type;
 
     if (config.mode === PathMappingMode.SIMPLE) {
-        modeLabel = 'Simple';
-        count = config.simple.length;
-        Icon = Type;
+      count = config.simple.length;
+      Icon = Type;
     } else {
-        modeLabel = 'Regex';
-        count = config.regex.localPre.length +
-                config.regex.localPost.length + 
-                config.regex.remotePre.length + 
-                config.regex.remotePost.length;
-        Icon = Code2;
+      count =
+        config.regex.localPre.length +
+        config.regex.localPost.length +
+        config.regex.remotePre.length +
+        config.regex.remotePost.length;
+      Icon = Code2;
     }
 
     if (count === 0) {
-        return {
-            label: 'Path Mapping',
-            value: 'Not Set',
-            active: false,
-            Icon: Icon
-        };
+      return {
+        label: t('dashboard.mapping'),
+        value: t('dashboard.notSet'),
+        active: false,
+        Icon,
+      };
     }
 
+    const modeLabel = config.mode === PathMappingMode.SIMPLE ? t('mapping.simple') : t('mapping.regex');
+
     return {
-        label: 'Path Mapping',
-        value: `${modeLabel} (${count})`,
-        active: true,
-        Icon: Icon
+      label: t('dashboard.mapping'),
+      value: `${modeLabel} (${count})`,
+      active: true,
+      Icon,
     };
   };
 
   const pathMappingInfo = getPathMappingDisplayInfo(pathMappingConfig);
 
+  // Helper: Calculate Backup Info
+  const getBackupDisplayInfo = (settings: BackupSettings) => {
+    if (!settings.enabled) {
+      return {
+        label: t('dashboard.backup'),
+        value: t('common.disabled'),
+        active: false,
+      };
+    }
+    return {
+      label: t('dashboard.backup'),
+      value: t('dashboard.keep', { count: settings.retentionCount }),
+      active: true,
+    };
+  };
+
+  const backupInfo = getBackupDisplayInfo(backupSettings);
+
   return (
     <div className="min-h-screen flex flex-col bg-gray-900 text-gray-100 font-sans overflow-hidden bg-[radial-gradient(ellipse_at_top,_var(--tw-gradient-stops))] from-gray-800 via-gray-900 to-black">
       
@@ -630,50 +677,105 @@ const App: React.FC = () => {
               
               {/* Normal Toolbar Right */}
               <div className="flex items-center gap-4">
-                  {/* Path Mapping Info */}
-                  <div className="flex flex-col items-end hidden md:flex border-r border-gray-700/50 pr-4 mr-1">
-                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
-                       {pathMappingInfo.label}
-                     </span>
-                     <div className={`text-xs font-mono flex items-center gap-1.5 ${pathMappingInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
-                        {pathMappingInfo.active && <pathMappingInfo.Icon size={12} />}
-                        <span>{pathMappingInfo.value}</span>
-                     </div>
+                  
+                  {/* Unified Status Dock */}
+                  <div className="hidden md:flex items-center bg-gray-900/40 border border-gray-700/50 rounded-lg p-1 mr-2 backdrop-blur-sm shadow-sm transition-all hover:bg-gray-900/60 hover:border-gray-600/50">
+                      
+                      {/* Path Mapping Section */}
+                      <div className="flex flex-col px-3 py-0.5 border-r border-gray-700/30 w-[120px] group/item">
+                         <span className={`text-[9px] font-bold uppercase tracking-widest transition-colors ${pathMappingInfo.active ? 'text-plex-orange' : 'text-gray-500 group-hover/item:text-gray-400'}`}>{pathMappingInfo.label}</span>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium ${pathMappingInfo.active ? 'text-blue-400' : 'text-gray-600'}`}>
+                            <pathMappingInfo.Icon size={12} strokeWidth={2.5} className="flex-shrink-0" />
+                              <OverflowMarquee>
+                                {pathMappingInfo.active ? pathMappingInfo.value : t('common.none')}
+                              </OverflowMarquee>
+                         </div>
+                      </div>
+
+                      {/* Backup Section */}
+                      <div className="flex flex-col px-3 py-0.5 border-r border-gray-700/30 w-[100px] group/item">
+                         <span className={`text-[9px] font-bold uppercase tracking-widest transition-colors ${backupInfo.active ? 'text-plex-orange' : 'text-gray-500 group-hover/item:text-gray-400'}`}>{backupInfo.label}</span>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium ${backupInfo.active ? 'text-indigo-400' : 'text-gray-600'}`}>
+                            <Archive size={12} strokeWidth={2.5} className="flex-shrink-0" />
+                           <OverflowMarquee>
+                             {backupInfo.active ? t('dashboard.retain', { count: backupSettings.retentionCount }) : backupInfo.value}
+                           </OverflowMarquee>
+                         </div>
+                      </div>
+
+                      {/* Schedule Section */}
+                      <div className="flex flex-col px-3 py-0.5 w-[180px] group/item">
+                         <div className="flex items-center justify-between">
+                            <span className={`text-[9px] font-bold uppercase tracking-widest transition-colors ${scheduleInfo.active ? 'text-plex-orange' : 'text-gray-500 group-hover/item:text-gray-400'}`}>{scheduleInfo.label}</span>
+                            {/* Watch Indicator Badge */}
+                            <div 
+                                className={`flex items-center gap-1 px-1 rounded-[2px] transition-colors ${scheduleInfo.autoWatch ? 'text-plex-orange bg-plex-orange/10' : 'text-gray-700 bg-gray-800'}`}
+                                title={scheduleInfo.autoWatch ? t('dashboard.watchModeActive') : t('dashboard.watchModeDisabled')}
+                            >
+                                {scheduleInfo.autoWatch ? <Eye size={9} /> : <EyeOff size={9} />}
+                                <span className="text-[8px] font-bold uppercase">{t('dashboard.watch')}</span>
+                            </div>
+                         </div>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium mt-0.5 ${scheduleInfo.active ? 'text-green-400' : 'text-gray-600'}`}>
+                            <Clock size={12} strokeWidth={2.5} className="flex-shrink-0" />
+                           <OverflowMarquee>
+                            {scheduleInfo.active ? scheduleInfo.value : t('common.disabled')}
+                           </OverflowMarquee>
+                         </div>
+                      </div>
                   </div>
 
-                  {/* Schedule Info */}
-                  <div className="flex flex-col items-end mr-2 md:mr-0 hidden md:flex">
-                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
-                       {scheduleInfo.label}
-                     </span>
-                     <div className="text-xs font-mono flex items-center gap-1.5">
-                       {/* Schedule Part */}
-                       <div className={`flex items-center gap-1.5 ${scheduleInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
-                          {scheduleInfo.active && <Clock size={12} />}
-                          <span>{scheduleInfo.value}</span>
-                       </div>
-
-                       {/* Watch Part */}
-                       <span className="text-gray-700 mx-0.5">|</span>
-                       <div 
-                         className={`flex items-center gap-1 ${scheduleInfo.autoWatch ? 'text-plex-orange' : 'text-gray-600'}`} 
-                         title={scheduleInfo.autoWatch ? "Local Playlist Monitoring Enabled" : "Local Playlist Monitoring Disabled"}
-                       >
-                           {scheduleInfo.autoWatch ? <Eye size={12} /> : <EyeOff size={12} />}
-                           <span className="text-[10px] font-sans font-bold">WATCH</span>
-                       </div>
-                     </div>
+                  {/* Language Switcher */}
+                  <div className="relative">
+                    <button
+                      onClick={() => setIsLangMenuOpen(!isLangMenuOpen)}
+                      className="flex items-center justify-center w-9 h-9 rounded-full border border-gray-700 bg-gray-800/50 text-gray-400 hover:text-white hover:bg-gray-700 transition-all"
+                      title={t('common.switchLanguage')}
+                    >
+                      <Languages size={18} />
+                    </button>
+                    {isLangMenuOpen && (
+                      <>
+                        <div className="fixed inset-0 z-40" onClick={() => setIsLangMenuOpen(false)}></div>
+                        <div className="absolute right-0 top-full mt-2 w-32 bg-gray-800 border border-gray-700 rounded-lg shadow-xl z-50 overflow-hidden">
+                          <button 
+                            onClick={() => { setLanguage('en'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'en' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            English
+                          </button>
+                          <button 
+                            onClick={() => { setLanguage('es'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'es' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            Español
+                          </button>
+                          <button 
+                            onClick={() => { setLanguage('chs'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'chs' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            简体中文
+                          </button>
+                          <button 
+                            onClick={() => { setLanguage('cht'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'cht' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            繁體中文
+                          </button>
+                        </div>
+                      </>
+                    )}
                   </div>
 
                   {/* Connection Status Button */}
-                  <button
+                  <button 
                     onClick={() => setIsConnectionModalOpen(true)}
-                    className={`flex items-center justify-center w-9 h-9 rounded-full border transition-all duration-300 hover:scale-105 active:scale-95 shadow-md ${
-                      isConnected
+                    className={`flex items-center justify-center w-9 h-9 rounded-full border transition-all duration-300 hover:scale-105 active:scale-95 shadow-md 
+                      ${isConnected 
                         ? "bg-green-500/10 border-green-500/50 text-green-400 hover:bg-green-500/20 hover:shadow-green-500/20"
                         : "bg-red-500/10 border-red-500/50 text-red-400 hover:bg-red-500/20 hover:shadow-red-500/20"
                       }`}
-                    title={isConnected ? "Connected to Plex" : "Disconnected"}
+                    title={isConnected ? t('dashboard.connected') : t('dashboard.disconnected')}
                   >
                     {isConnected ? <Server size={18} /> : <ServerOff size={18} />}
                   </button>
@@ -690,7 +792,7 @@ const App: React.FC = () => {
                  }}
                >
                   <h1 className={`text-xl md:text-2xl font-black tracking-[0.2em] uppercase whitespace-nowrap transition-colors duration-300 ${syncState === SyncState.SUCCESS ? 'text-[#22c55e]' : 'text-[#F59E0B]'}`}>
-                    {syncState === SyncState.SYNCING ? 'SYNCHRONIZING' : 'SYNC COMPLETE'}
+                    {syncState === SyncState.SYNCING ? t('dashboard.synchronizing') : t('dashboard.syncComplete')}
                   </h1>
                </div>
             </div>
@@ -749,6 +851,8 @@ const App: React.FC = () => {
                 onSelect={handleStrategyChange}
                 savedPathMapping={pathMappingConfig}
                 onSavePathMapping={handleSavePathMapping}
+                savedBackup={backupSettings}
+                onSaveBackup={handleSaveBackupSettings}
                 savedSchedule={scheduleSettings}
                 onSaveSchedule={handleSaveSchedule}
                 syncState={syncState}
@@ -773,7 +877,7 @@ const App: React.FC = () => {
       
       {/* Footer */}
       <footer className="flex-none py-4 text-center text-xs text-gray-600 border-t border-white/5 bg-gray-900/50 backdrop-blur">
-        <p>&copy; {new Date().getFullYear()} PlexSync Manager. Connected to Docker backend.</p>
+        <p>{t('app.footer', { year: new Date().getFullYear() })}</p>
       </footer>
 
       {/* Modals */}

frontend/LanguageContext.tsx

@@ -0,0 +1,63 @@
+import React, { createContext, useContext, useEffect, useState, ReactNode } from 'react';
+import { translations, Language } from './translations';
+
+interface LanguageContextProps {
+  language: Language;
+  setLanguage: (lang: Language) => void;
+  t: (path: string, params?: Record<string, string | number>) => string;
+}
+
+const LanguageContext = createContext<LanguageContextProps | undefined>(undefined);
+
+export const LanguageProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
+  const [language, setLanguageState] = useState<Language>('en');
+
+  useEffect(() => {
+    const savedLang = localStorage.getItem('plexsync-language') as Language;
+    if (savedLang && translations[savedLang]) {
+      setLanguageState(savedLang);
+    }
+  }, []);
+
+  const setLanguage = (lang: Language) => {
+    setLanguageState(lang);
+    localStorage.setItem('plexsync-language', lang);
+  };
+
+  const t = (path: string, params?: Record<string, string | number>): string => {
+    const keys = path.split('.');
+    let current: any = translations[language];
+
+    for (const key of keys) {
+      if (current[key] === undefined) {
+        console.warn(`Missing translation for key: ${path} in language: ${language}`);
+        return path;
+      }
+      current = current[key];
+    }
+
+    let text = current as string;
+
+    if (params) {
+      Object.entries(params).forEach(([key, value]) => {
+        text = text.replace(`{${key}}`, String(value));
+      });
+    }
+
+    return text;
+  };
+
+  return (
+    <LanguageContext.Provider value={{ language, setLanguage, t }}>
+      {children}
+    </LanguageContext.Provider>
+  );
+};
+
+export const useLanguage = () => {
+  const context = useContext(LanguageContext);
+  if (!context) {
+    throw new Error('useLanguage must be used within a LanguageProvider');
+  }
+  return context;
+};

frontend/components/ConnectionModal.tsx

@@ -3,6 +3,7 @@ import React, { useState, useEffect, useRef } from 'react';
 import { PlexConnectionSettings, PlexServerConnection, PlexLibrary } from '../types';
 import { apiService } from '../services/api';
 import { X, Server, Lock, User, Key, Globe, Eye, EyeOff, CheckCircle, Library, ChevronDown, ChevronRight, Settings, Loader2 } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 interface ConnectionModalProps {
   isOpen: boolean;
@@ -13,6 +14,7 @@ interface ConnectionModalProps {
 }
 
 const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onConnectSuccess, onShowMessage, initialSettings }) => {
+  const { t } = useLanguage();
   const [formData, setFormData] = useState<PlexConnectionSettings>({
     protocol: 'http',
     address: '',
@@ -35,10 +37,12 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
   const [selectedLibraryId, setSelectedLibraryId] = useState<string>('');
 
   const abortControllerRef = useRef<AbortController | null>(null);
+  const prevIsOpenRef = useRef(isOpen);
 
   // Reset state when opening
   useEffect(() => {
-    if (isOpen) {
+    // Only execute reset logic when modal opens (isOpen changes from false to true)
+    if (isOpen && !prevIsOpenRef.current) {
       setError(null);
       setConnectedServerInfo(null);
       setLibraries([]);
@@ -54,12 +58,15 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
         }));
       }
     }
-    return () => {
-       // Cleanup any pending request if modal closes
+
+    // Cleanup when closing
+    if (!isOpen && prevIsOpenRef.current) {
        if (abortControllerRef.current) {
          abortControllerRef.current.abort();
        }
-    };
+    }
+
+    prevIsOpenRef.current = isOpen;
   }, [isOpen, initialSettings]);
 
   if (!isOpen) return null;
@@ -85,9 +92,9 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
        onConnectSuccess(updatedInfo);
        const saveResult = await apiService.updateLibrary(lib.title);
        if (saveResult.status !== 'success') {
-         onShowMessage(saveResult.message || 'Failed to save library selection');
+         onShowMessage(saveResult.message || t('toasts.librarySaveFailed'));
        } else {
-         onShowMessage(`Library switched to ${lib.title}`);
+         onShowMessage(t('toasts.librarySwitched', { library: lib.title }));
        }
     }
   };
@@ -107,7 +114,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
         abortControllerRef.current.abort();
         abortControllerRef.current = null;
         setIsConnecting(false);
-        setError("Connection cancelled by user.");
+        setError(t('toasts.connectionCancelled'));
       }
       return;
     }
@@ -136,13 +143,14 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
       const info = result.data.serverInfo;
       setConnectedServerInfo(info);
-      onShowMessage(`Successfully connected to ${info.name || 'Plex Server'}`);
+      onShowMessage(t('toasts.connectedTo', { name: info.name || 'Plex Server' }));
 
       const libs = info.libraries || [];
-      setLibraries(libs);
-      if (libs.length > 0) {
+      const musicLibraries = libs.filter((lib) => lib.type === 'artist').sort((a, b) => a.title.localeCompare(b.title));
+      setLibraries(musicLibraries);
+      if (musicLibraries.length > 0) {
           const preferred = info.libraryName || formData.libraryName;
-          const defaultLib = libs.find(lib => lib.title === preferred) || libs[0];
+          const defaultLib = musicLibraries.find(lib => lib.title === preferred) || musicLibraries[0];
           setSelectedLibraryId(defaultLib.id);
           setFormData(prev => ({ ...prev, libraryName: defaultLib.title }));
           onConnectSuccess({
@@ -151,13 +159,13 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
           });
           const saveResult = await apiService.updateLibrary(defaultLib.title);
           if (saveResult.status !== 'success') {
-            setError(saveResult.message || 'Failed to save library selection');
+            setError(saveResult.message || t('toasts.librarySaveFailed'));
           }
       } else {
           onConnectSuccess(info);
       }
     } else {
-      setError(result.message || "Connection failed");
+      setError(result.message || t('server.connectionFailed'));
     }
   };
 
@@ -177,7 +185,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
         <div className="px-6 py-4 bg-gray-800 border-b border-gray-700 flex items-center justify-between flex-none">
           <h3 className="text-lg font-semibold text-white flex items-center gap-2">
             <Server size={18} className={isConnected ? "text-green-400" : "text-plex-orange"} />
-            {isConnected ? 'Server Connected' : 'Connect Plex Server'}
+            {isConnected ? t('connection.titleConnected') : t('connection.titleConnect')}
           </h3>
           <button onClick={onClose} className="text-gray-400 hover:text-white transition-colors">
             <X size={20} />
@@ -196,7 +204,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
             {/* Server Connection */}
             <div className="space-y-3">
-                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">Server Details</label>
+              <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">{t('connection.serverDetails')}</label>
                 <div className="grid grid-cols-4 gap-3">
                 <div className="col-span-1">
                     <select
@@ -220,7 +228,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                         name="address"
                         required
                         disabled={isConnected || isConnecting}
-                        placeholder="IP Address or Domain"
+                      placeholder={t('connection.address')}
                         value={formData.address}
                         onChange={handleChange}
                         className={`w-full h-10 pl-9 pr-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -234,7 +242,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     type="text" 
                     name="port"
                     disabled={isConnected || isConnecting}
-                    placeholder="Port (e.g. 32400)"
+                  placeholder={t('connection.port')}
                     value={formData.port}
                     onChange={handleChange}
                     className={`w-full h-10 px-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -246,7 +254,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
             {/* Authentication */}
             <div className="space-y-3">
-                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">Authentication</label>
+              <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">{t('connection.authentication')}</label>
                 
                 {/* Token */}
                 <div className="relative">
@@ -257,7 +265,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     type="text" 
                     name="token"
                     disabled={isConnected || isConnecting}
-                    placeholder="X-Plex-Token (Optional)"
+                  placeholder={t('connection.token')}
                     value={formData.token}
                     onChange={handleChange}
                     className={`w-full h-10 pl-9 pr-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all font-mono ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -279,7 +287,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             type="text" 
                             name="username"
                             disabled={isTokenProvided || isConnecting}
-                            placeholder="Username / Email"
+                          placeholder={t('connection.username')}
                             value={formData.username}
                             onChange={handleChange}
                             className={`w-full h-10 pl-9 pr-3 rounded-md text-sm transition-all focus:outline-none ${disabledInputClass}`}
@@ -295,7 +303,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             type={showPassword ? "text" : "password"} 
                             name="password"
                             disabled={isTokenProvided || isConnecting}
-                            placeholder="Password"
+                          placeholder={t('connection.password')}
                             value={formData.password}
                             onChange={handleChange}
                             className={`w-full h-10 pl-9 pr-10 rounded-md text-sm transition-all focus:outline-none ${disabledInputClass}`}
@@ -323,7 +331,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                 >
                   <div className="flex items-center gap-2">
                     <Settings size={14} />
-                    <span>Advanced Options</span>
+                    <span>{t('connection.advanced')}</span>
                   </div>
                   {showAdvanced ? <ChevronDown size={14} /> : <ChevronRight size={14} />}
                 </button>
@@ -331,7 +339,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                 {showAdvanced && (
                   <div className="p-3 bg-gray-900/50 space-y-3 animate-in slide-in-from-top-2">
                     <div>
-                      <label className="text-xs text-gray-500 mb-1 block">Connection Timeout (Seconds)</label>
+                      <label className="text-xs text-gray-500 mb-1 block">{t('connection.timeout')}</label>
                       <input 
                         type="number"
                         min="1"
@@ -360,15 +368,15 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     {isConnecting ? (
                       <>
                         <Loader2 size={16} className="animate-spin" />
-                        <span>Connecting... <span className="opacity-75 font-normal ml-1">(Cancel)</span></span>
+                        <span>{t('connection.connecting')} <span className="opacity-75 font-normal ml-1">({t('common.cancel')})</span></span>
                       </>
-                    ) : 'Connect Server'}
+                    ) : t('connection.connectBtn')}
                 </button>
             ) : (
                 <div className="mt-2 p-2 bg-green-500/10 border border-green-500/20 rounded-lg text-center">
                     <p className="text-green-400 text-sm font-semibold flex items-center justify-center gap-2">
                         <CheckCircle size={16} />
-                        Connected Successfully
+                      {t('connection.connectedSuccess')}
                     </p>
                 </div>
             )}
@@ -377,7 +385,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
             {/* Library Selection - Appears after connection */}
             {isConnected && libraries.length > 0 && (
                 <div className="mt-6 pt-5 border-t border-gray-700 animate-in slide-in-from-top-2 fade-in">
-                    <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider block mb-2">Select Library to Sync</label>
+                  <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider block mb-2">{t('connection.selectLibrary')}</label>
                     <div className="relative">
                         <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                             <Library size={14} className="text-plex-orange" />
@@ -401,7 +409,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             onClick={onClose}
                             className="px-6 py-2 bg-gray-700 hover:bg-gray-600 text-white text-sm font-medium rounded-lg transition-colors border border-gray-600 hover:border-gray-500"
                         >
-                            Done
+                          {t('common.done')}
                         </button>
                     </div>
                 </div>

frontend/components/OverflowMarquee.tsx

@@ -0,0 +1,117 @@
+import React, { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react';
+
+type OverflowMarqueeProps = {
+  children: React.ReactNode;
+  className?: string;
+  textClassName?: string;
+  title?: string;
+  speedPxPerSec?: number;
+  minDurationSec?: number;
+};
+
+type MarqueeMetrics = {
+  isOverflowing: boolean;
+  overflowPx: number;
+  durationSec: number;
+};
+
+const DEFAULT_SPEED_PX_PER_SEC = 24;
+const DEFAULT_MIN_DURATION_SEC = 4;
+
+const OverflowMarquee: React.FC<OverflowMarqueeProps> = ({
+  children,
+  className,
+  textClassName,
+  title,
+  speedPxPerSec = DEFAULT_SPEED_PX_PER_SEC,
+  minDurationSec = DEFAULT_MIN_DURATION_SEC,
+}) => {
+  const containerRef = useRef<HTMLSpanElement>(null);
+  const textRef = useRef<HTMLSpanElement>(null);
+  const [metrics, setMetrics] = useState<MarqueeMetrics>({
+    isOverflowing: false,
+    overflowPx: 0,
+    durationSec: minDurationSec,
+  });
+
+  const fallbackTitle = useMemo(() => {
+    if (title) return title;
+    return typeof children === 'string' ? children : undefined;
+  }, [children, title]);
+
+  const recompute = () => {
+    const container = containerRef.current;
+    const text = textRef.current;
+    if (!container || !text) return;
+
+    // Ensure we measure with current layout.
+    const available = container.clientWidth;
+    const content = text.scrollWidth;
+    const overflowPx = Math.ceil(content - available);
+
+    if (overflowPx > 1) {
+      const durationSec = Math.max(minDurationSec, overflowPx / Math.max(1, speedPxPerSec));
+      setMetrics({ isOverflowing: true, overflowPx, durationSec });
+    } else {
+      // Avoid re-render loops if already not overflowing.
+      setMetrics((prev) => (prev.isOverflowing ? { isOverflowing: false, overflowPx: 0, durationSec: minDurationSec } : prev));
+    }
+  };
+
+  useLayoutEffect(() => {
+    recompute();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [children]);
+
+  useEffect(() => {
+    recompute();
+
+    const container = containerRef.current;
+    const text = textRef.current;
+    if (!container || !text) return;
+
+    const ro = new ResizeObserver(() => recompute());
+    ro.observe(container);
+    ro.observe(text);
+
+    const onResize = () => recompute();
+    window.addEventListener('resize', onResize);
+
+    return () => {
+      ro.disconnect();
+      window.removeEventListener('resize', onResize);
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  const textStyle: React.CSSProperties | undefined = metrics.isOverflowing
+    ? ({
+        ['--marquee-distance' as any]: `${metrics.overflowPx}px`,
+        ['--marquee-duration' as any]: `${metrics.durationSec}s`,
+      } satisfies React.CSSProperties)
+    : undefined;
+
+  return (
+    <span
+      ref={containerRef}
+      className={['overflow-marquee', className].filter(Boolean).join(' ')}
+      title={fallbackTitle}
+    >
+      <span
+        ref={textRef}
+        className={[
+          'overflow-marquee__text',
+          metrics.isOverflowing ? 'overflow-marquee__text--animate' : '',
+          textClassName,
+        ]
+          .filter(Boolean)
+          .join(' ')}
+        style={textStyle}
+      >
+        {children}
+      </span>
+    </span>
+  );
+};
+
+export default OverflowMarquee;

frontend/components/PlaylistCard.tsx

@@ -1,26 +1,31 @@
 import React from 'react';
 import { Playlist } from '../types';
 import { Disc3, Clock } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
+import OverflowMarquee from './OverflowMarquee';
 
 interface PlaylistCardProps {
   playlist: Playlist;
 }
 
 const PlaylistCard: React.FC<PlaylistCardProps> = ({ playlist }) => {
+  const { t } = useLanguage();
   return (
     <div className="group flex flex-col w-full p-2.5 bg-gray-800/60 rounded-md border border-gray-700/50 hover:bg-gray-700 hover:border-plex-orange/50 transition-all duration-200 cursor-pointer shadow-sm">
       <div className="flex items-center justify-between">
-        <h4 className="text-sm font-medium text-gray-200 truncate flex-1 mr-2 group-hover:text-white transition-colors">
-          {playlist.title}
+        <h4 className="text-sm font-medium text-gray-200 flex-1 mr-2 group-hover:text-white transition-colors min-w-0">
+          <OverflowMarquee>
+            {playlist.title}
+          </OverflowMarquee>
         </h4>
       </div>
       
       <div className="flex items-center mt-1.5 space-x-4 text-xs text-gray-500 group-hover:text-gray-400">
-        <span className="flex items-center" title="Track Count">
+        <span className="flex items-center" title={t('playlist.trackCount')}>
           <Disc3 size={12} className="mr-1.5 opacity-70" />
           {playlist.trackCount}
         </span>
-        <span className="flex items-center" title="Last Updated">
+        <span className="flex items-center" title={t('playlist.lastUpdated')}>
           <Clock size={12} className="mr-1.5 opacity-70" />
           {new Date(playlist.lastUpdated).toLocaleDateString()}
         </span>

frontend/components/ServerPanel.tsx

@@ -3,6 +3,8 @@ import React from 'react';
 import { Playlist, ServerType, PlexServerConnection } from '../types';
 import PlaylistCard from './PlaylistCard';
 import { RefreshCw, Server, Cloud, WifiOff, X } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
+import OverflowMarquee from './OverflowMarquee';
 
 interface ServerPanelProps {
   type: ServerType;
@@ -14,6 +16,7 @@ interface ServerPanelProps {
 }
 
 const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, onRefresh, onCancel, serverInfo }) => {
+  const { t } = useLanguage();
   const isLocal = type === ServerType.LOCAL;
   
   let Icon = isLocal ? Server : Cloud;
@@ -28,39 +31,44 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
   let displaySubtitle: React.ReactNode = null;
 
   if (isLocal) {
-    displayTitle = 'Local Server';
+    displayTitle = t('server.local');
     displaySubtitle = (
       <p className="text-xs text-gray-400 font-medium mt-0.5 md:mt-0 md:ml-0">
-        {playlists.length} Playlists
+        {t('server.playlists', { count: playlists.length })}
       </p>
     );
   } else {
     // Cloud Logic
     if (serverInfo) {
       if (serverInfo.isConnected) {
-        displayTitle = serverInfo.name || 'Cloud Server';
+        displayTitle = serverInfo.name || t('server.cloud');
         displaySubtitle = (
            <div className="flex items-center text-xs text-gray-300 font-medium space-x-1.5 truncate mt-0.5 md:mt-0">
-              <span className="text-plex-orange truncate font-semibold">{serverInfo.libraryName}</span>
+              <span className="text-plex-orange font-semibold min-w-0 max-w-full">
+                <span className="block md:hidden truncate">{serverInfo.libraryName}</span>
+                <OverflowMarquee className="hidden md:inline-block">
+                  {serverInfo.libraryName}
+                </OverflowMarquee>
+              </span>
               <span className="text-gray-600 hidden md:inline">•</span>
               <span className="text-gray-500 font-mono text-[10px] hidden md:inline">{serverInfo.ip}:{serverInfo.port}</span>
            </div>
         );
       } else {
-        displayTitle = 'Not Connected';
+        displayTitle = t('server.notConnected');
         Icon = WifiOff;
         headerColor = 'text-red-400';
         displaySubtitle = (
           <p className="text-xs text-gray-500 font-medium mt-0.5">
-             Connection failed
+             {t('server.connectionFailed')}
           </p>
         );
       }
     } else {
-      displayTitle = 'Cloud Server';
+      displayTitle = t('server.cloud');
       displaySubtitle = (
         <p className="text-xs text-gray-500 font-medium mt-0.5">
-           {isLoading ? 'Connecting...' : 'Waiting...'}
+           {isLoading ? t('server.connecting') : t('server.waiting')}
         </p>
       );
     }
@@ -121,7 +129,7 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
                : 'text-gray-400 hover:text-white hover:bg-white/10'
              }
           `}
-          title={isLoading ? "Cancel Refresh" : "Refresh Playlists"}
+          title={isLoading ? t('server.cancelRefresh') : t('server.refreshPlaylists')}
         >
           {isLoading ? (
             <div className="relative flex items-center justify-center">
@@ -141,11 +149,11 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
         {isLoading && playlists.length === 0 ? (
           <div className="flex flex-col items-center justify-center h-full text-gray-500 space-y-3">
             <RefreshCw size={24} className="animate-spin text-plex-orange/50" />
-            <p className="text-xs font-medium tracking-wide uppercase">Syncing...</p>
+            <p className="text-xs font-medium tracking-wide uppercase">{t('server.syncing')}</p>
           </div>
         ) : playlists.length === 0 ? (
           <div className="flex flex-col items-center justify-center h-full text-gray-500">
-            <p className="text-sm">No playlists found.</p>
+            <p className="text-sm">{t('server.noPlaylists')}</p>
           </div>
         ) : (
           <div className="space-y-2.5 md:space-y-3">

frontend/components/StrategySelector.tsx

@@ -1,5 +1,5 @@
 import React, { useState, useRef, useEffect } from 'react';
-import { SyncStrategy, ReplacementRule, PathMappingConfig, PathMappingRules, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode } from '../types';
+import { SyncStrategy, ReplacementRule, PathMappingConfig, PathMappingRules, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode, BackupSettings } from '../types';
 import { 
   ArrowRightCircle, 
   ArrowLeftCircle, 
@@ -16,11 +16,14 @@ import {
   Calendar,
   Clock,
   Repeat,
-  CheckSquare,
-  Square,
   Type,
-  Code2
+  Code2,
+  Link,
+  Archive,
+  History,
+  Eye
 } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 // Generate a UUID for mapping rules
 const generateUUID = (): string => {
@@ -38,8 +41,8 @@ const generateUUID = (): string => {
 
 interface StrategyOption {
   value: SyncStrategy;
-  label: string;
-  description: string;
+  labelKey: string;
+  descKey: string;
   icon: React.ElementType;
   color: string;
 }
@@ -47,35 +50,35 @@ interface StrategyOption {
 const STRATEGIES: StrategyOption[] = [
   {
     value: SyncStrategy.LOCAL_OVERWRITE,
-    label: 'Local Overwrite',
-    description: 'Local playlist completely overwrites Cloud. (No Diff)',
+    labelKey: 'strategies.localOverwrite.label',
+    descKey: 'strategies.localOverwrite.desc',
     icon: ArrowRightCircle,
     color: 'text-blue-400'
   },
   {
     value: SyncStrategy.CLOUD_OVERWRITE,
-    label: 'Cloud Overwrite',
-    description: 'Cloud playlist completely overwrites Local. (No Diff)',
+    labelKey: 'strategies.cloudOverwrite.label',
+    descKey: 'strategies.cloudOverwrite.desc',
     icon: ArrowLeftCircle,
     color: 'text-green-400'
   },
   {
     value: SyncStrategy.MERGE_LOCAL,
-    label: 'Two-way Merge (Local Priority)',
-    description: 'Merge both. Conflicts resolve to Local version.',
+    labelKey: 'strategies.mergeLocal.label',
+    descKey: 'strategies.mergeLocal.desc',
     icon: GitMerge,
     color: 'text-blue-300'
   },
   {
     value: SyncStrategy.MERGE_CLOUD,
-    label: 'Two-way Merge (Cloud Priority)',
-    description: 'Merge both. Conflicts resolve to Cloud version.',
+    labelKey: 'strategies.mergeCloud.label',
+    descKey: 'strategies.mergeCloud.desc',
     icon: GitMerge,
     color: 'text-green-300'
   }
 ];
 
-const WEEK_DAYS = ['S', 'M', 'T', 'W', 'T', 'F', 'S'];
+const WEEK_DAY_INDEXES = [0, 1, 2, 3, 4, 5, 6];
 
 // Color Theme Variables for Mapping Editors
 const MAPPING_THEME = {
@@ -104,17 +107,12 @@ const MAPPING_THEME = {
 const deriveEffectiveSchedule = (schedule: ScheduleSettings, tab: ScheduleMode): ScheduleSettings => {
   const derived = { ...schedule };
   
-  if (tab === ScheduleMode.CRON) {
-     derived.mode = derived.cronExpression.trim() !== '' ? ScheduleMode.CRON : ScheduleMode.DISABLED;
+  // Unified logic: If the mode matches the tab, we keep it (Enabled).
+  // If the mode doesn't match (e.g. it was DISABLED), then in the context of this tab, it remains Disabled until the user toggles the switch.
+  if (derived.mode === tab) {
+    derived.mode = tab;
   } else {
-    // For Daily/Weekly
-    // If the mode matches the tab, we keep it (Enabled).
-    // If the mode doesn't match (e.g. it was CRON or DISABLED), then in the context of this tab, it is effectively Disabled until the user checks the box.
-    if (derived.mode === tab) {
-      derived.mode = tab;
-    } else {
-      derived.mode = ScheduleMode.DISABLED;
-    }
+    derived.mode = ScheduleMode.DISABLED;
   }
   return derived;
 };
@@ -148,6 +146,7 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
   leftInputClass,
   rightInputClass
 }) => {
+  const { t } = useLanguage();
   
   const handleAdd = () => {
     if (isLocked) return;
@@ -179,7 +178,7 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
            onClick={handleAdd}
            disabled={isLocked}
            className="p-1 rounded bg-gray-700/50 hover:bg-gray-600 text-gray-400 hover:text-white transition-colors"
-           title="Add Rule"
+           title={t('common.add')}
          >
            <Plus size={12} />
          </button>
@@ -188,22 +187,22 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
        <div className="flex-1 space-y-2 overflow-y-auto max-h-32 custom-scrollbar pr-1">
          {rules.length === 0 ? (
            <div className="text-xs text-gray-600 italic text-center py-2 border border-dashed border-gray-700/50 rounded-lg">
-             No rules defined.
+             {t('mapping.noRules')}
            </div>
          ) : (
            rules.map((rule) => (
              <div key={rule.id} className="flex items-center space-x-1 animate-in slide-in-from-left-1 duration-200">
                 <input 
                   type="text" 
-                  placeholder={leftPlaceholder}
+                  placeholder={leftPlaceholder || t('mapping.pattern')}
                   value={rule.search}
                   onChange={(e) => handleUpdate(rule.id, 'search', e.target.value)}
                   className={`flex-1 min-w-0 border rounded px-1.5 py-1 text-xs focus:outline-none transition-colors ${leftInputClass || defaultInputStyle}`}
                 />
-                <ArrowRightCircle size={10} className="text-gray-600 flex-none opacity-50" />
+                <Link size={12} className="text-gray-600 flex-none opacity-50" />
                 <input 
                   type="text" 
-                  placeholder={rightPlaceholder}
+                  placeholder={rightPlaceholder || t('mapping.replace')}
                   value={rule.replace}
                   onChange={(e) => handleUpdate(rule.id, 'replace', e.target.value)}
                   className={`flex-1 min-w-0 border rounded px-1.5 py-1 text-xs focus:outline-none transition-colors ${rightInputClass || defaultInputStyle}`}
@@ -227,6 +226,8 @@ interface StrategySelectorProps {
   onSelect: (strategy: SyncStrategy, label: string) => void;
   savedPathMapping: PathMappingConfig;
   onSavePathMapping: (config: PathMappingConfig) => void;
+  savedBackup: BackupSettings;
+  onSaveBackup: (settings: BackupSettings) => void;
   savedSchedule: ScheduleSettings;
   onSaveSchedule: (settings: ScheduleSettings) => Promise<boolean>;
   syncState: SyncState;
@@ -238,11 +239,14 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   onSelect, 
   savedPathMapping, 
   onSavePathMapping,
+  savedBackup,
+  onSaveBackup,
   savedSchedule,
   onSaveSchedule,
   syncState,
   onSync
 }) => {
+  const { t } = useLanguage();
   const [isOpen, setIsOpen] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
@@ -250,6 +254,10 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   const [localPathMapping, setLocalPathMapping] = useState<PathMappingConfig>(savedPathMapping);
   const [isMappingDirty, setIsMappingDirty] = useState(false);
 
+  // Local state for Backup Settings
+  const [localBackup, setLocalBackup] = useState<BackupSettings>(savedBackup);
+  const [isBackupDirty, setIsBackupDirty] = useState(false);
+
   // Local state for Schedule editing
   const [localSchedule, setLocalSchedule] = useState<ScheduleSettings>(savedSchedule);
   const [isScheduleDirty, setIsScheduleDirty] = useState(false);
@@ -268,6 +276,11 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
     setIsMappingDirty(false);
   }, [savedPathMapping]);
 
+  useEffect(() => {
+    setLocalBackup(JSON.parse(JSON.stringify(savedBackup)));
+    setIsBackupDirty(false);
+  }, [savedBackup]);
+
   useEffect(() => {
     setLocalSchedule(JSON.parse(JSON.stringify(savedSchedule)));
     if (savedSchedule.mode !== ScheduleMode.DISABLED) {
@@ -282,6 +295,12 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
     setIsMappingDirty(isDifferent);
   }, [localPathMapping, savedPathMapping]);
 
+  // Check dirty state for backup
+  useEffect(() => {
+    const isDifferent = JSON.stringify(localBackup) !== JSON.stringify(savedBackup);
+    setIsBackupDirty(isDifferent);
+  }, [localBackup, savedBackup]);
+
   // Check dirty state for Schedule (including Active Tab changes)
   useEffect(() => {
     const effectiveLocal = deriveEffectiveSchedule(localSchedule, activeScheduleTab);
@@ -305,7 +324,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
 
   const handleSelect = (strategy: StrategyOption) => {
     if (isLocked) return;
-    onSelect(strategy.value, strategy.label);
+    onSelect(strategy.value, t(strategy.labelKey));
   };
 
   // --- Path Mapping Handlers ---
@@ -365,6 +384,22 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   const regexRules = localPathMapping.regex;
   const simpleRules = localPathMapping.simple;
 
+  // --- Backup Handlers ---
+  const handleUpdateBackup = (field: keyof BackupSettings, value: any) => {
+    if (isLocked) return;
+    setLocalBackup(prev => ({ ...prev, [field]: value }));
+  };
+
+  const handleResetBackup = () => {
+    if (isLocked) return;
+    setLocalBackup(JSON.parse(JSON.stringify(savedBackup)));
+  };
+
+  const handleSaveBackupClick = () => {
+    if (isLocked) return;
+    onSaveBackup(localBackup);
+  };
+
   // --- Schedule Handlers ---
   const handleUpdateSchedule = (field: keyof ScheduleSettings, value: any) => {
     if (isLocked) return;
@@ -421,7 +456,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
       <button
         onClick={() => setIsOpen(!isOpen)}
         className="flex items-center justify-center w-12 h-12 rounded-full bg-gray-800/90 border border-gray-600 hover:border-plex-orange text-gray-300 hover:text-white hover:bg-gray-700/80 transition-all shadow-2xl hover:shadow-plex-orange/30 ring-[6px] md:ring-8 ring-gray-900 backdrop-blur-sm active:scale-95"
-        title={`Current Strategy: ${selectedOption.label}`}
+        title={`${t('strategies.title')}: ${t(selectedOption.labelKey)}`}
       >
         <selectedOption.icon size={22} className={selectedOption.color} strokeWidth={2.5} />
         <div className="absolute -bottom-1 -right-1 bg-gray-900 rounded-full border border-gray-600 p-[2px] shadow-sm">
@@ -447,7 +482,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             
             {/* Section 1: Sync Strategy */}
             <div className="px-4 py-3 bg-black/20 border-b border-white/5 flex-none">
-            <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest mb-2">Sync Strategy</h3>
+            <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest mb-2">{t('strategies.title')}</h3>
             <div className="space-y-1">
                 {STRATEGIES.map((strategy) => (
                 <div
@@ -462,7 +497,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     <div className="flex items-center space-x-3 overflow-hidden">
                     <strategy.icon size={18} className={strategy.color} />
                     <span className={`text-sm font-medium truncate ${currentStrategy === strategy.value ? 'text-white' : 'text-gray-300 group-hover:text-white'}`}>
-                        {strategy.label}
+                      {t(strategy.labelKey)}
                     </span>
                     </div>
                     
@@ -470,7 +505,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     <div className="relative group/tooltip">
                         <HelpCircle size={14} className="text-gray-600 hover:text-gray-400 transition-colors" />
                         <div className="absolute right-0 bottom-full mb-2 w-48 p-2.5 bg-gray-900 text-xs text-gray-300 rounded-lg shadow-xl border border-gray-700 pointer-events-none opacity-0 group-hover/tooltip:opacity-100 transition-opacity z-50">
-                            {strategy.description}
+                          {t(strategy.descKey)}
                         </div>
                     </div>
                     
@@ -483,17 +518,94 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             </div>
             </div>
 
+            {/* Section 1.5: Backup Retention */}
+            <div className="px-4 py-3 bg-gray-900/40 border-b border-white/5 flex-none">
+              <div className="flex items-center justify-between mb-3">
+                <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('backup.title')}</h3>
+              </div>
+              
+              <div className="flex flex-col space-y-3">
+                 <div className="flex items-center justify-between">
+                    <div className="flex items-center space-x-2">
+                       <div className="p-1.5 rounded-lg bg-indigo-500/10 border border-indigo-500/20 text-indigo-400">
+                          <Archive size={16} />
+                       </div>
+                       <div className="flex flex-col">
+                          <span className="text-sm font-medium text-gray-200">{t('backup.enable')}</span>
+                          <span className="text-[10px] text-gray-500">{t('backup.enableDesc')}</span>
+                       </div>
+                    </div>
+
+                    <button 
+                      onClick={() => handleUpdateBackup('enabled', !localBackup.enabled)}
+                      className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localBackup.enabled ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                    >
+                      <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localBackup.enabled ? 'translate-x-6' : 'translate-x-1'}`} />
+                    </button>
+                 </div>
+                 
+                 {/* Expanded Config */}
+                 <div className={`overflow-hidden transition-all duration-300 ${localBackup.enabled ? 'max-h-20 opacity-100' : 'max-h-0 opacity-50'}`}>
+                    <div className="flex items-center justify-between p-2.5 rounded-lg bg-black/20 border border-white/5">
+                        <div className="flex items-center space-x-2">
+                           <History size={14} className="text-gray-500" />
+                          <span className="text-xs text-gray-400">{t('backup.maxVersions')}</span>
+                        </div>
+                        <div className="flex items-center space-x-2">
+                            <input 
+                               type="number" 
+                               min="0" 
+                               max="100" 
+                               value={localBackup.retentionCount}
+                               onChange={(e) => {
+                                 const value = parseInt(e.target.value, 10);
+                                 handleUpdateBackup('retentionCount', isNaN(value) ? 0 : Math.max(0, value));
+                               }}
+                               className="w-16 bg-gray-800 border border-gray-700 text-center text-sm rounded py-1 text-white focus:border-plex-orange focus:outline-none"
+                            />
+                            <span className="text-[10px] text-gray-600 italic">{localBackup.retentionCount === 0 ? t('backup.noAutoDelete') : t('backup.autoDelete')}</span>
+                        </div>
+                    </div>
+                 </div>
+
+                 <div className="flex justify-end items-center gap-2 pt-1">
+                    <button
+                        onClick={handleResetBackup}
+                        disabled={!isBackupDirty}
+                        className={`flex items-center justify-center space-x-1.5 px-3 py-1.5 rounded-md text-xs font-medium border transition-all
+                        ${isBackupDirty 
+                            ? 'bg-gray-800 border-gray-600 text-gray-300 hover:bg-gray-700 hover:text-white' 
+                            : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
+                    >
+                        <RotateCcw size={12} />
+                        <span>{t('common.revert')}</span>
+                    </button>
+                    <button
+                        onClick={handleSaveBackupClick}
+                        disabled={!isBackupDirty}
+                        className={`flex items-center justify-center space-x-1.5 px-3 py-1.5 rounded-md text-xs font-bold border transition-all
+                        ${isBackupDirty 
+                            ? 'bg-plex-orange border-plex-orange text-gray-900 hover:bg-yellow-500 shadow-lg shadow-plex-orange/10' 
+                            : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
+                    >
+                        <Save size={12} />
+                        <span>{t('common.save')}</span>
+                    </button>
+                 </div>
+              </div>
+            </div>
+
             {/* Section 2: Path Mapping (Tabs + Grid) */}
             <div className="p-4 bg-gray-900/40 border-b border-white/5 flex-none">
                 <div className="flex items-center justify-between mb-3">
-                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">Path Mapping</h3>
+                <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('mapping.title')}</h3>
                 </div>
 
                 {/* Tabs for Path Mapping Mode */}
                 <div className="flex space-x-1 bg-black/30 p-1 rounded-lg mb-4">
                   {[
-                    { id: PathMappingMode.SIMPLE, label: 'Simple Mapping', icon: Type },
-                    { id: PathMappingMode.REGEX, label: 'Regex Rules', icon: Code2 },
+                    { id: PathMappingMode.SIMPLE, label: t('mapping.simple'), icon: Type },
+                    { id: PathMappingMode.REGEX, label: t('mapping.regex'), icon: Code2 },
                   ].map((tab) => (
                     <button
                       key={tab.id}
@@ -504,8 +616,8 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                           : 'text-gray-400 hover:text-gray-200 hover:bg-white/5'
                         }`}
                     >
-                        <tab.icon size={12} />
-                        <span>{tab.label}</span>
+                      <tab.icon size={12} />
+                      <span>{tab.label}</span>
                     </button>
                   ))}
                 </div>
@@ -516,15 +628,15 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                        // Simple Mode: Single Editor
                        <div className="animate-in fade-in duration-200">
                           <MappingGroupEditor 
-                             title="Path Mapping"
-                             subtitle="Map Local paths to Cloud paths using simple string matching"
+                              title={t('mapping.simpleTitle')}
+                              subtitle={t('mapping.simpleSubtitle')}
                              rules={simpleRules}
                              onChange={updateSimpleGroup}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.simple.borderColor}
                              bgColor={MAPPING_THEME.simple.bgColor}
-                             leftPlaceholder="Local Path"
-                             rightPlaceholder="Cloud Path"
+                              leftPlaceholder={t('mapping.localPath')}
+                              rightPlaceholder={t('mapping.cloudPath')}
                              leftInputClass={MAPPING_THEME.inputs.local}
                              rightInputClass={MAPPING_THEME.inputs.cloud}
                           />
@@ -534,8 +646,8 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                        <div className="grid grid-cols-1 md:grid-cols-2 gap-4 animate-in fade-in duration-200">
                           {/* Row 1: Pre-Processing */}
                           <MappingGroupEditor 
-                             title="Local Playlist"
-                             subtitle="Pre-Processing (Before Sync)"
+                              title={t('server.local')}
+                              subtitle={t('mapping.regexPre')}
                              rules={regexRules.localPre}
                              onChange={(rules) => updateRegexGroup('localPre', rules)}
                              isLocked={isLocked}
@@ -544,8 +656,8 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                           />
 
                           <MappingGroupEditor 
-                             title="Remote Playlist"
-                             subtitle="Pre-Processing (Before Sync)"
+                              title={t('server.cloud')}
+                              subtitle={t('mapping.regexPre')}
                              rules={regexRules.remotePre}
                              onChange={(rules) => updateRegexGroup('remotePre', rules)}
                              isLocked={isLocked}
@@ -555,8 +667,8 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
 
                           {/* Row 2: Post-Processing */}
                           <MappingGroupEditor 
-                             title="Local Playlist"
-                             subtitle="Post-Processing (After Sync / Result)"
+                              title={t('server.local')}
+                              subtitle={t('mapping.regexPost')}
                              rules={regexRules.localPost}
                              onChange={(rules) => updateRegexGroup('localPost', rules)}
                              isLocked={isLocked}
@@ -565,8 +677,8 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                           />
 
                           <MappingGroupEditor 
-                             title="Remote Playlist"
-                             subtitle="Post-Processing (After Sync / Result)"
+                              title={t('server.cloud')}
+                              subtitle={t('mapping.regexPost')}
                              rules={regexRules.remotePost}
                              onChange={(rules) => updateRegexGroup('remotePost', rules)}
                              isLocked={isLocked}
@@ -587,7 +699,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                             : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
                     >
                         <RotateCcw size={12} />
-                        <span>Revert</span>
+                        <span>{t('common.revert')}</span>
                     </button>
                     <button
                         onClick={handleSaveMappingClick}
@@ -598,7 +710,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                             : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
                     >
                         <Save size={12} />
-                        <span>Save Rules</span>
+                        <span>{t('mapping.saveRules')}</span>
                     </button>
                 </div>
             </div>
@@ -606,15 +718,14 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             {/* Section 3: Scheduled Tasks */}
             <div className="p-4 bg-gray-900/40 border-b border-white/5 flex-none">
                  <div className="flex items-center justify-between mb-3">
-                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">Scheduled Tasks</h3>
+                  <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('schedule.title')}</h3>
                  </div>
 
-                 {/* Tabs */}
                  <div className="flex space-x-1 bg-black/30 p-1 rounded-lg mb-4">
-                    {[
-                      { id: ScheduleMode.CRON, label: 'Cron', icon: Repeat },
-                      { id: ScheduleMode.DAILY, label: 'Daily', icon: Clock },
-                      { id: ScheduleMode.WEEKLY, label: 'Weekly', icon: Calendar },
+                   {[
+                      { id: ScheduleMode.CRON, label: t('schedule.cron'), icon: Repeat },
+                      { id: ScheduleMode.DAILY, label: t('schedule.daily'), icon: Clock },
+                      { id: ScheduleMode.WEEKLY, label: t('schedule.weekly'), icon: Calendar },
                     ].map((tab) => (
                       <button
                         key={tab.id}
@@ -634,35 +745,49 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                  {/* Tab Content */}
                  <div className="mb-4 min-h-[50px]">
                     {activeScheduleTab === ScheduleMode.CRON && (
-                      <div className="space-y-2 animate-in fade-in duration-200">
-                         <div className="flex items-center space-x-2">
-                           <span className="text-gray-500 font-mono text-xs">Cron:</span>
-                           <input 
-                             type="text" 
-                             value={localSchedule.cronExpression}
-                             onChange={(e) => handleUpdateSchedule('cronExpression', e.target.value)}
-                             placeholder="0 0 * * *"
-                             className="flex-1 bg-gray-800 border border-gray-700 rounded-md px-2.5 py-1.5 text-xs text-gray-200 font-mono focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange placeholder-gray-600"
-                           />
+                      <div className="flex flex-col animate-in fade-in duration-200">
+                         {/* Top Row: Label + Switch */}
+                         <div className="flex items-center justify-between mb-3 px-1">
+                           <span className="text-xs text-gray-400 font-medium">{t('schedule.enableCron')}</span>
+                           <button 
+                               onClick={() => toggleScheduleEnable(ScheduleMode.CRON)}
+                               className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.CRON ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                           >
+                               <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.CRON ? 'translate-x-6' : 'translate-x-1'}`} />
+                           </button>
+                         </div>
+
+                         {/* Content */}
+                         <div className={`space-y-2 transition-opacity duration-200 ${localSchedule.mode !== ScheduleMode.CRON ? 'opacity-50 pointer-events-none' : ''}`}>
+                             <div className="flex items-center space-x-2">
+                               <span className="text-gray-500 font-mono text-xs">Cron:</span>
+                               <input 
+                                 type="text" 
+                                 value={localSchedule.cronExpression}
+                                 onChange={(e) => handleUpdateSchedule('cronExpression', e.target.value)}
+                                 placeholder="0 0 * * *"
+                                 disabled={localSchedule.mode !== ScheduleMode.CRON}
+                                 className="flex-1 bg-gray-800 border border-gray-700 rounded-md px-2.5 py-1.5 text-xs text-gray-200 font-mono focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange placeholder-gray-600"
+                               />
+                             </div>
+                             <p className="text-[10px] text-gray-500">
+                               Unix-cron format.
+                             </p>
                          </div>
-                         <p className="text-[10px] text-gray-500">
-                           Unix-cron format. Leave empty to disable schedule.
-                         </p>
                       </div>
                     )}
 
                     {activeScheduleTab === ScheduleMode.DAILY && (
                        <div className="flex flex-col animate-in fade-in duration-200">
-                          {/* Top Row: Checkbox + Label */}
-                          <div className="flex items-center justify-start space-x-2 mb-2">
+                          {/* Top Row: Label + Switch */}
+                          <div className="flex items-center justify-between mb-3 px-1">
+                            <span className="text-xs text-gray-400 font-medium">{t('schedule.enableDaily')}</span>
                             <button 
                                 onClick={() => toggleScheduleEnable(ScheduleMode.DAILY)}
-                                className={`transition-colors flex-none ${localSchedule.mode === ScheduleMode.DAILY ? 'text-plex-orange' : 'text-gray-500 hover:text-gray-400'}`}
-                                title={localSchedule.mode === ScheduleMode.DAILY ? "Schedule Enabled" : "Schedule Disabled"}
+                                className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.DAILY ? 'bg-plex-orange' : 'bg-gray-700'}`}
                             >
-                                {localSchedule.mode === ScheduleMode.DAILY ? <CheckSquare size={16} /> : <Square size={16} />}
+                                <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.DAILY ? 'translate-x-6' : 'translate-x-1'}`} />
                             </button>
-                            <label className="text-xs text-gray-400 font-medium">Run daily at:</label>
                           </div>
                           
                           {/* Bottom Row: Centered Native Time Input */}
@@ -680,26 +805,25 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
 
                     {activeScheduleTab === ScheduleMode.WEEKLY && (
                        <div className="flex flex-col animate-in fade-in duration-200">
-                          {/* Top Row: Checkbox + Label */}
-                          <div className="flex items-center justify-start space-x-2 mb-2">
-                              <button 
+                          {/* Top Row: Label + Switch */}
+                          <div className="flex items-center justify-between mb-3 px-1">
+                            <span className="text-xs text-gray-400 font-medium">{t('schedule.enableWeekly')}</span>
+                            <button 
                                 onClick={() => toggleScheduleEnable(ScheduleMode.WEEKLY)}
-                                className={`transition-colors flex-none ${localSchedule.mode === ScheduleMode.WEEKLY ? 'text-plex-orange' : 'text-gray-500 hover:text-gray-400'}`}
-                                title={localSchedule.mode === ScheduleMode.WEEKLY ? "Schedule Enabled" : "Schedule Disabled"}
-                              >
-                                  {localSchedule.mode === ScheduleMode.WEEKLY ? <CheckSquare size={16} /> : <Square size={16} />}
-                              </button>
-                              <label className="text-xs text-gray-400 font-medium">Run on days:</label>
+                                className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.WEEKLY ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                            >
+                                <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.WEEKLY ? 'translate-x-6' : 'translate-x-1'}`} />
+                            </button>
                           </div>
 
                           {/* Middle Row: Full Width Capsules */}
                           <div className={`grid grid-cols-7 w-full transition-opacity duration-200 mb-3 ${localSchedule.mode !== ScheduleMode.WEEKLY ? 'opacity-50 pointer-events-none' : ''}`}>
-                             {WEEK_DAYS.map((day, index) => {
-                               const isSelected = localSchedule.weeklyDays.includes(index);
+                             {WEEK_DAY_INDEXES.map((dayIndex) => {
+                               const isSelected = localSchedule.weeklyDays.includes(dayIndex);
                                return (
                                  <button
-                                   key={index}
-                                   onClick={() => toggleWeekDay(index)}
+                                   key={dayIndex}
+                                   onClick={() => toggleWeekDay(dayIndex)}
                                    className={`h-9 text-xs font-bold border-y border-l last:border-r border-gray-600/50 transition-colors
                                      first:rounded-l-lg last:rounded-r-lg
                                      ${isSelected 
@@ -708,7 +832,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                                      }
                                    `}
                                  >
-                                   {day}
+                                   {t(`schedule.weekdaysNarrow.${dayIndex}`)}
                                  </button>
                                )
                              })}
@@ -728,20 +852,22 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     )}
                  </div>
 
-                 {/* Auto Watch Checkbox */}
-                 <div className="flex items-center mb-4 px-1">
+                 {/* Auto Watch Switch */}
+                 <div className="flex items-center justify-between mb-4 mt-2 px-1">
+                    <div className="flex items-center space-x-2">
+                        <div className="p-1.5 rounded-lg bg-orange-500/10 border border-orange-500/20 text-orange-400">
+                             <Eye size={16} />
+                        </div>
+                        <div className="flex flex-col">
+                             <span className="text-sm font-medium text-gray-200">{t('schedule.watchLocal')}</span>
+                             <span className="text-[10px] text-gray-500">{t('schedule.watchDesc')}</span>
+                        </div>
+                    </div>
                     <button 
-                      onClick={() => handleUpdateSchedule('autoWatch', !localSchedule.autoWatch)}
-                      className="flex items-center space-x-2 group"
+                        onClick={() => handleUpdateSchedule('autoWatch', !localSchedule.autoWatch)}
+                        className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.autoWatch ? 'bg-plex-orange' : 'bg-gray-700'}`}
                     >
-                       {localSchedule.autoWatch ? (
-                         <CheckSquare size={16} className="text-plex-orange" />
-                       ) : (
-                         <Square size={16} className="text-gray-600 group-hover:text-gray-400" />
-                       )}
-                       <span className={`text-xs ${localSchedule.autoWatch ? 'text-gray-200' : 'text-gray-500 group-hover:text-gray-400'}`}>
-                         Watch for local playlist changes
-                       </span>
+                        <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.autoWatch ? 'translate-x-6' : 'translate-x-1'}`} />
                     </button>
                  </div>
 
@@ -756,7 +882,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                                 : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
                         >
                             <RotateCcw size={12} />
-                            <span>Revert</span>
+                            <span>{t('common.revert')}</span>
                         </button>
                         <button
                             onClick={handleSaveScheduleClick}
@@ -767,7 +893,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                                 : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
                         >
                             <Save size={12} />
-                            <span>Save</span>
+                            <span>{t('common.save')}</span>
                         </button>
                     </div>
             </div>
@@ -781,7 +907,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                 className={`w-full py-3 rounded-lg text-sm font-bold flex items-center justify-center gap-2 transition-all shadow-lg
                 ${isLocked 
                     ? 'bg-gray-700/30 text-gray-500 cursor-not-allowed border border-gray-700/50' 
-                    : isMappingDirty
+                    : isMappingDirty || isBackupDirty
                         ? 'bg-gray-800 text-gray-500 cursor-not-allowed border border-gray-700'
                         : 'bg-green-600 hover:bg-green-500 text-white border border-green-500 shadow-green-900/20 active:scale-[0.98]'
                 }`}
@@ -789,18 +915,18 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                 {isSyncing ? (
                     <>
                         <Loader2 size={16} className="animate-spin" />
-                        <span>Sync in Progress...</span>
+                        <span>{t('strategies.syncing')}</span>
                     </>
                 ) : (
                     <>
                         <Zap size={16} fill="currentColor" />
-                        <span>Sync Now</span>
+                        <span>{t('strategies.syncNow')}</span>
                     </>
                 )}
             </button>
-            {(isMappingDirty) && (
+            {(isMappingDirty || isBackupDirty) && (
                 <p className="text-[10px] text-plex-orange text-center mt-2">
-                    Please save path mapping changes before syncing.
+                    {t('strategies.saveWarning')}
                 </p>
             )}
         </div>

frontend/index.html

@@ -36,6 +36,41 @@
       ::-webkit-scrollbar-thumb:hover {
         background: #6b7280; 
       }
+
+      /* Overflow marquee (auto-scroll when truncated) */
+      .overflow-marquee {
+        display: inline-block;
+        overflow: hidden;
+        white-space: nowrap;
+        max-width: 100%;
+      }
+
+      .overflow-marquee__text {
+        display: inline-block;
+        will-change: transform;
+      }
+
+      .overflow-marquee__text--animate {
+        animation: overflow-marquee-scroll var(--marquee-duration, 6s) linear infinite;
+      }
+
+      @keyframes overflow-marquee-scroll {
+        0%, 12% {
+          transform: translateX(0);
+        }
+        70%, 86% {
+          transform: translateX(calc(var(--marquee-distance, 0px) * -1));
+        }
+        100% {
+          transform: translateX(0);
+        }
+      }
+
+      @media (prefers-reduced-motion: reduce) {
+        .overflow-marquee__text--animate {
+          animation: none;
+        }
+      }
     </style>
   <script type="importmap">
 {

frontend/index.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App';
+import { LanguageProvider } from './LanguageContext';
 
 const rootElement = document.getElementById('root');
 if (!rootElement) {
@@ -10,6 +11,8 @@ if (!rootElement) {
 const root = ReactDOM.createRoot(rootElement);
 root.render(
   <React.StrictMode>
-    <App />
+    <LanguageProvider>
+      <App />
+    </LanguageProvider>
   </React.StrictMode>
 );

frontend/locales/cht.ts

@@ -0,0 +1,161 @@
+export const cht = {
+  app: {
+    title: 'PlexSync',
+    manager: '管理',
+    footer: '© {year} PMS Playlist Sync。已連線至 Docker 後端。',
+  },
+  common: {
+    save: '儲存',
+    cancel: '取消',
+    revert: '還原',
+    delete: '刪除',
+    done: '完成',
+    loading: '載入中…',
+    refresh: '重新整理',
+    close: '關閉',
+    none: '無',
+    disabled: '已停用',
+    add: '新增',
+    switchLanguage: '切換語言',
+  },
+  server: {
+    local: '本機伺服器',
+    cloud: '雲端伺服器',
+    playlists: '{count} 個播放清單',
+    notConnected: '未連線',
+    connectionFailed: '連線失敗',
+    connecting: '連線中…',
+    waiting: '等待中…',
+    syncing: '同步中…',
+    noPlaylists: '找不到播放清單。',
+    cancelRefresh: '取消重新整理',
+    refreshPlaylists: '重新整理播放清單',
+  },
+  playlist: {
+    trackCount: '曲目數',
+    lastUpdated: '上次更新',
+  },
+  dashboard: {
+    mapping: '路徑對應',
+    backup: '備份',
+    autoSync: '自動同步',
+    watch: '監看',
+    watchModeActive: '監看模式：啟用',
+    watchModeDisabled: '監看模式：停用',
+    notSet: '未設定',
+    retain: '保留：{count}',
+    keep: '保留 {count}',
+    connected: '已連線至 Plex',
+    disconnected: '未連線',
+    synchronizing: 'SYNCHRONIZING',
+    syncComplete: 'SYNC COMPLETE',
+  },
+  strategies: {
+    title: '同步策略',
+    localOverwrite: {
+      label: '本機覆寫',
+      desc: '本機播放清單完全覆寫雲端。（無 Diff）',
+    },
+    cloudOverwrite: {
+      label: '雲端覆寫',
+      desc: '雲端播放清單完全覆寫本機。（無 Diff）',
+    },
+    mergeLocal: {
+      label: '雙向合併（本機優先）',
+      desc: '合併兩端。衝突以本機版本為準。',
+    },
+    mergeCloud: {
+      label: '雙向合併（雲端優先）',
+      desc: '合併兩端。衝突以雲端版本為準。',
+    },
+    syncNow: '立即同步',
+    syncing: '同步進行中…',
+    saveWarning: '同步前請先儲存待處理的變更（備份/路徑對應）。',
+  },
+  mapping: {
+    title: '路徑對應',
+    simple: '簡易對應',
+    regex: 'Regex 規則',
+    simpleTitle: '路徑對應',
+    simpleSubtitle: '使用簡單字串比對將本機路徑對應到雲端路徑',
+    regexPre: '前處理（同步前）',
+    regexPost: '後處理（同步後 / 結果）',
+    localPath: '本機路徑',
+    cloudPath: '雲端路徑',
+    pattern: '模式',
+    replace: '取代',
+    saveRules: '儲存規則',
+    noRules: '尚未定義規則。',
+  },
+  backup: {
+    title: '備份保留',
+    enable: '啟用備份',
+    enableDesc: '變更前建立副本',
+    maxVersions: '保留的最大版本數：',
+    noAutoDelete: '不自動刪除',
+    autoDelete: '自動刪除最舊版本',
+  },
+  schedule: {
+    title: '排程任務',
+    cron: 'Cron',
+    daily: '每日',
+    weekly: '每週',
+    weekdaysNarrow: {
+      0: '日',
+      1: '一',
+      2: '二',
+      3: '三',
+      4: '四',
+      5: '五',
+      6: '六',
+    },
+    enableCron: '啟用 Cron 排程',
+    enableDaily: '啟用每日執行',
+    enableWeekly: '啟用每週執行',
+    watchLocal: '監看本機變更',
+    watchDesc: '本機播放清單更新時自動同步',
+    schedule: '排程',
+    notConfigured: '尚未設定',
+    today: '今天',
+    tomorrow: '明天',
+  },
+  connection: {
+    titleConnected: '伺服器已連線',
+    titleConnect: '連線 Plex 伺服器',
+    serverDetails: '伺服器詳細資訊',
+    authentication: '驗證',
+    protocol: '通訊協定',
+    address: 'IP 位址或網域',
+    port: '連接埠',
+    token: 'X-Plex-Token（選填）',
+    username: '使用者名稱 / 電子郵件',
+    password: '密碼',
+    advanced: '進階選項',
+    timeout: '連線逾時（秒）',
+    connectBtn: '連線伺服器',
+    connecting: '連線中…',
+    connectedSuccess: '連線成功',
+    selectLibrary: '選擇要同步的媒體庫',
+  },
+  toasts: {
+    localRefreshCancelled: '已取消本機重新整理。',
+    cloudRefreshCancelled: '已取消雲端重新整理。',
+    strategySaved: '已儲存選擇的策略「{strategy}」。',
+    strategySaveFailed: '儲存同步策略失敗。',
+    mappingSaved: '已儲存路徑對應規則。',
+    mappingSaveFailed: '儲存路徑對應規則失敗。',
+    backupSaved: '已儲存備份設定。',
+    backupFailed: '儲存備份設定失敗。',
+    scheduleDisabled: '已停用排程任務。',
+    scheduleEmpty: '已停用排程任務（Cron 為空）。',
+    scheduleStarted: '排程任務更新成功。',
+    scheduleFailed: '更新排程失敗。',
+    syncFailed: '同步失敗。請檢查連線。',
+    backgroundSyncSuccess: '背景同步已成功完成。',
+    backgroundSyncFailed: '背景同步失敗：{error}',
+    librarySwitched: '媒體庫已切換為 {library}',
+    connectedTo: '已成功連線到 {name}',
+    connectionCancelled: '使用者已取消連線。',
+    librarySaveFailed: '儲存媒體庫選擇失敗。',
+  },
+};

frontend/locales/en.ts

@@ -0,0 +1,161 @@
+export const en = {
+  app: {
+    title: 'PlexSync',
+    manager: 'Manager',
+    footer: '© {year} PMS Playlist Sync. Connected to Docker backend.',
+  },
+  common: {
+    save: 'Save',
+    cancel: 'Cancel',
+    revert: 'Revert',
+    delete: 'Delete',
+    done: 'Done',
+    loading: 'Loading...',
+    refresh: 'Refresh',
+    close: 'Close',
+    none: 'None',
+    disabled: 'Disabled',
+    add: 'Add',
+    switchLanguage: 'Switch Language',
+  },
+  server: {
+    local: 'Local Server',
+    cloud: 'Cloud Server',
+    playlists: '{count} Playlists',
+    notConnected: 'Not Connected',
+    connectionFailed: 'Connection failed',
+    connecting: 'Connecting...',
+    waiting: 'Waiting...',
+    syncing: 'Syncing...',
+    noPlaylists: 'No playlists found.',
+    cancelRefresh: 'Cancel Refresh',
+    refreshPlaylists: 'Refresh Playlists',
+  },
+  playlist: {
+    trackCount: 'Track Count',
+    lastUpdated: 'Last Updated',
+  },
+  dashboard: {
+    mapping: 'Mapping',
+    backup: 'Backup',
+    autoSync: 'Auto-Sync',
+    watch: 'Watch',
+    watchModeActive: 'Watch Mode: Active',
+    watchModeDisabled: 'Watch Mode: Disabled',
+    notSet: 'Not Set',
+    retain: 'Retain: {count}',
+    keep: 'Keep {count}',
+    connected: 'Connected to Plex',
+    disconnected: 'Disconnected',
+    synchronizing: 'SYNCHRONIZING',
+    syncComplete: 'SYNC COMPLETE',
+  },
+  strategies: {
+    title: 'Sync Strategy',
+    localOverwrite: {
+      label: 'Local Overwrite',
+      desc: 'Local playlist completely overwrites Cloud. (No Diff)',
+    },
+    cloudOverwrite: {
+      label: 'Cloud Overwrite',
+      desc: 'Cloud playlist completely overwrites Local. (No Diff)',
+    },
+    mergeLocal: {
+      label: 'Two-way Merge (Local Priority)',
+      desc: 'Merge both. Conflicts resolve to Local version.',
+    },
+    mergeCloud: {
+      label: 'Two-way Merge (Cloud Priority)',
+      desc: 'Merge both. Conflicts resolve to Cloud version.',
+    },
+    syncNow: 'Sync Now',
+    syncing: 'Sync in Progress...',
+    saveWarning: 'Please save pending changes (Backups/Path Mapping) before syncing.',
+  },
+  mapping: {
+    title: 'Path Mapping',
+    simple: 'Simple Mapping',
+    regex: 'Regex Rules',
+    simpleTitle: 'Path Mapping',
+    simpleSubtitle: 'Map Local paths to Cloud paths using simple string matching',
+    regexPre: 'Pre-Processing (Before Sync)',
+    regexPost: 'Post-Processing (After Sync / Result)',
+    localPath: 'Local Path',
+    cloudPath: 'Cloud Path',
+    pattern: 'Pattern',
+    replace: 'Replace',
+    saveRules: 'Save Rules',
+    noRules: 'No rules defined.',
+  },
+  backup: {
+    title: 'Backup Retention',
+    enable: 'Enable Backups',
+    enableDesc: 'Create a copy before changes',
+    maxVersions: 'Max versions to keep:',
+    noAutoDelete: 'No auto-delete',
+    autoDelete: 'Oldest deleted automatically',
+  },
+  schedule: {
+    title: 'Scheduled Tasks',
+    cron: 'Cron',
+    daily: 'Daily',
+    weekly: 'Weekly',
+    weekdaysNarrow: {
+      0: 'S',
+      1: 'M',
+      2: 'T',
+      3: 'W',
+      4: 'T',
+      5: 'F',
+      6: 'S',
+    },
+    enableCron: 'Enable Cron Schedule',
+    enableDaily: 'Enable Daily Run',
+    enableWeekly: 'Enable Weekly Run',
+    watchLocal: 'Watch Local Changes',
+    watchDesc: 'Auto-sync when local playlist updates',
+    schedule: 'Schedule',
+    notConfigured: 'Not configured',
+    today: 'Today',
+    tomorrow: 'Tomorrow',
+  },
+  connection: {
+    titleConnected: 'Server Connected',
+    titleConnect: 'Connect Plex Server',
+    serverDetails: 'Server Details',
+    authentication: 'Authentication',
+    protocol: 'Protocol',
+    address: 'IP Address or Domain',
+    port: 'Port',
+    token: 'X-Plex-Token (Optional)',
+    username: 'Username / Email',
+    password: 'Password',
+    advanced: 'Advanced Options',
+    timeout: 'Connection Timeout (Seconds)',
+    connectBtn: 'Connect Server',
+    connecting: 'Connecting...',
+    connectedSuccess: 'Connected Successfully',
+    selectLibrary: 'Select Library to Sync',
+  },
+  toasts: {
+    localRefreshCancelled: 'Local refresh cancelled.',
+    cloudRefreshCancelled: 'Cloud refresh cancelled.',
+    strategySaved: 'Selected strategy "{strategy}" has been saved.',
+    strategySaveFailed: 'Failed to save sync strategy.',
+    mappingSaved: 'Path mapping rules have been saved.',
+    mappingSaveFailed: 'Failed to save path mapping rules.',
+    backupSaved: 'Backup settings have been saved.',
+    backupFailed: 'Failed to save backup settings.',
+    scheduleDisabled: 'Scheduled tasks disabled.',
+    scheduleEmpty: 'Scheduled tasks disabled (Empty Cron).',
+    scheduleStarted: 'Scheduled task updated successfully.',
+    scheduleFailed: 'Failed to update schedule.',
+    syncFailed: 'Sync failed. Please check connection.',
+    backgroundSyncSuccess: 'Background sync completed successfully.',
+    backgroundSyncFailed: 'Background sync failed: {error}',
+    librarySwitched: 'Library switched to {library}',
+    connectedTo: 'Successfully connected to {name}',
+    connectionCancelled: 'Connection cancelled by user.',
+    librarySaveFailed: 'Failed to save library selection.',
+  },
+};

frontend/locales/es.ts

@@ -0,0 +1,161 @@
+export const es = {
+  app: {
+    title: 'PlexSync',
+    manager: 'Gestor',
+    footer: '© {year} PMS Playlist Sync. Conectado al backend Docker.',
+  },
+  common: {
+    save: 'Guardar',
+    cancel: 'Cancelar',
+    revert: 'Revertir',
+    delete: 'Eliminar',
+    done: 'Hecho',
+    loading: 'Cargando...',
+    refresh: 'Actualizar',
+    close: 'Cerrar',
+    none: 'Ninguno',
+    disabled: 'Deshabilitado',
+    add: 'Añadir',
+    switchLanguage: 'Cambiar idioma',
+  },
+  server: {
+    local: 'Servidor Local',
+    cloud: 'Servidor Nube',
+    playlists: '{count} Listas',
+    notConnected: 'No Conectado',
+    connectionFailed: 'Conexión fallida',
+    connecting: 'Conectando...',
+    waiting: 'Esperando...',
+    syncing: 'Sincronizando...',
+    noPlaylists: 'No se encontraron listas.',
+    cancelRefresh: 'Cancelar',
+    refreshPlaylists: 'Actualizar Listas',
+  },
+  playlist: {
+    trackCount: 'Pistas',
+    lastUpdated: 'Actualizado',
+  },
+  dashboard: {
+    mapping: 'Mapeo',
+    backup: 'Respaldo',
+    autoSync: 'Auto-Sync',
+    watch: 'Vigilar',
+    watchModeActive: 'Modo Vigía: Activo',
+    watchModeDisabled: 'Modo Vigía: Desactivado',
+    notSet: 'No Def.',
+    retain: 'Retener: {count}',
+    keep: 'Guardar {count}',
+    connected: 'Conectado a Plex',
+    disconnected: 'Desconectado',
+    synchronizing: 'SINCRONIZANDO',
+    syncComplete: 'SINCRONIZACIÓN COMPLETA',
+  },
+  strategies: {
+    title: 'Estrategia de Sync',
+    localOverwrite: {
+      label: 'Sobreescribir Local',
+      desc: 'La lista local sobreescribe la nube. (Sin Diff)',
+    },
+    cloudOverwrite: {
+      label: 'Sobreescribir Nube',
+      desc: 'La lista de la nube sobreescribe la local. (Sin Diff)',
+    },
+    mergeLocal: {
+      label: 'Fusión (Prioridad Local)',
+      desc: 'Fusionar ambas. Conflictos resueltos a versión Local.',
+    },
+    mergeCloud: {
+      label: 'Fusión (Prioridad Nube)',
+      desc: 'Fusionar ambas. Conflictos resueltos a versión Nube.',
+    },
+    syncNow: 'Sincronizar Ahora',
+    syncing: 'Sincronizando...',
+    saveWarning: 'Guarde los cambios pendientes (Respaldos/Mapeo) antes de sincronizar.',
+  },
+  mapping: {
+    title: 'Mapeo de Rutas',
+    simple: 'Mapeo Simple',
+    regex: 'Reglas Regex',
+    simpleTitle: 'Mapeo de Rutas',
+    simpleSubtitle: 'Mapear rutas locales a la nube usando coincidencia simple',
+    regexPre: 'Pre-Procesamiento (Antes de Sync)',
+    regexPost: 'Post-Procesamiento (Después de Sync)',
+    localPath: 'Ruta Local',
+    cloudPath: 'Ruta Nube',
+    pattern: 'Patrón',
+    replace: 'Reemplazo',
+    saveRules: 'Guardar Reglas',
+    noRules: 'No hay reglas definidas.',
+  },
+  backup: {
+    title: 'Retención de Respaldo',
+    enable: 'Habilitar Respaldos',
+    enableDesc: 'Crear copia antes de cambios',
+    maxVersions: 'Máx versiones a guardar:',
+    noAutoDelete: 'Sin auto-borrado',
+    autoDelete: 'El más antiguo se borra automáticamente',
+  },
+  schedule: {
+    title: 'Tareas Programadas',
+    cron: 'Cron',
+    daily: 'Diario',
+    weekly: 'Semanal',
+    weekdaysNarrow: {
+      0: 'D',
+      1: 'L',
+      2: 'M',
+      3: 'X',
+      4: 'J',
+      5: 'V',
+      6: 'S',
+    },
+    enableCron: 'Habilitar Cron',
+    enableDaily: 'Habilitar Ejecución Diaria',
+    enableWeekly: 'Habilitar Ejecución Semanal',
+    watchLocal: 'Vigilar Cambios Locales',
+    watchDesc: 'Auto-sync cuando la lista local se actualiza',
+    schedule: 'Horario',
+    notConfigured: 'No configurado',
+    today: 'Hoy',
+    tomorrow: 'Mañana',
+  },
+  connection: {
+    titleConnected: 'Servidor Conectado',
+    titleConnect: 'Conectar Servidor Plex',
+    serverDetails: 'Detalles del Servidor',
+    authentication: 'Autenticación',
+    protocol: 'Protocolo',
+    address: 'Dirección IP o Dominio',
+    port: 'Puerto',
+    token: 'X-Plex-Token (Opcional)',
+    username: 'Usuario / Email',
+    password: 'Password',
+    advanced: 'Opciones Avanzadas',
+    timeout: 'Tiempo de espera (Segundos)',
+    connectBtn: 'Conectar Servidor',
+    connecting: 'Conectando...',
+    connectedSuccess: 'Conectado Exitosamente',
+    selectLibrary: 'Seleccionar Librería',
+  },
+  toasts: {
+    localRefreshCancelled: 'Actualización local cancelada.',
+    cloudRefreshCancelled: 'Actualización nube cancelada.',
+    strategySaved: 'Estrategia seleccionada "{strategy}" guardada.',
+    strategySaveFailed: 'Error al guardar estrategia de sync.',
+    mappingSaved: 'Reglas de mapeo guardadas.',
+    mappingSaveFailed: 'Error al guardar reglas de mapeo.',
+    backupSaved: 'Configuración de respaldo guardada.',
+    backupFailed: 'Error al guardar configuración de respaldo.',
+    scheduleDisabled: 'Tareas programadas deshabilitadas.',
+    scheduleEmpty: 'Tareas programadas deshabilitadas (Cron Vacío).',
+    scheduleStarted: 'Tarea programada actualizada exitosamente.',
+    scheduleFailed: 'Error al actualizar horario.',
+    syncFailed: 'Fallo en sync. Revise conexión.',
+    backgroundSyncSuccess: 'Sync en segundo plano completado.',
+    backgroundSyncFailed: 'Sync en segundo plano falló: {error}',
+    librarySwitched: 'Librería cambiada a {library}',
+    connectedTo: 'Conectado exitosamente a {name}',
+    connectionCancelled: 'Conexión cancelada por usuario.',
+    librarySaveFailed: 'Error al guardar selección de librería.',
+  },
+};

frontend/locales/zh.ts

@@ -0,0 +1,161 @@
+export const zh = {
+  app: {
+    title: 'PlexSync',
+    manager: '管理',
+    footer: '© {year} PMS Playlist Sync。已连接到 Docker 后端。',
+  },
+  common: {
+    save: '保存',
+    cancel: '取消',
+    revert: '恢复',
+    delete: '删除',
+    done: '完成',
+    loading: '加载中...',
+    refresh: '刷新',
+    close: '关闭',
+    none: '无',
+    disabled: '已禁用',
+    add: '添加',
+    switchLanguage: '切换语言',
+  },
+  server: {
+    local: '本地服务器',
+    cloud: '云端服务器',
+    playlists: '{count} 个播放列表',
+    notConnected: '未连接',
+    connectionFailed: '连接失败',
+    connecting: '正在连接...',
+    waiting: '等待中...',
+    syncing: '同步中...',
+    noPlaylists: '未找到播放列表。',
+    cancelRefresh: '取消刷新',
+    refreshPlaylists: '刷新播放列表',
+  },
+  playlist: {
+    trackCount: '曲目数',
+    lastUpdated: '最近更新',
+  },
+  dashboard: {
+    mapping: '路径映射',
+    backup: '备份',
+    autoSync: '自动同步',
+    watch: '监听',
+    watchModeActive: '监听模式：启用',
+    watchModeDisabled: '监听模式：禁用',
+    notSet: '未设置',
+    retain: '保留：{count}',
+    keep: '保留 {count}',
+    connected: '已连接 Plex',
+    disconnected: '未连接',
+    synchronizing: 'SYNCHRONIZING',
+    syncComplete: 'SYNC COMPLETE',
+  },
+  strategies: {
+    title: '同步策略',
+    localOverwrite: {
+      label: '本地覆盖',
+      desc: '本地播放列表完全覆盖云端。（无 Diff）',
+    },
+    cloudOverwrite: {
+      label: '云端覆盖',
+      desc: '云端播放列表完全覆盖本地。（无 Diff）',
+    },
+    mergeLocal: {
+      label: '双向合并（本地优先）',
+      desc: '合并两端。冲突以本地版本为准。',
+    },
+    mergeCloud: {
+      label: '双向合并（云端优先）',
+      desc: '合并两端。冲突以云端版本为准。',
+    },
+    syncNow: '立即同步',
+    syncing: '同步进行中...',
+    saveWarning: '同步前请先保存待处理的更改（备份/路径映射）。',
+  },
+  mapping: {
+    title: '路径映射',
+    simple: '简单映射',
+    regex: '正则规则',
+    simpleTitle: '路径映射',
+    simpleSubtitle: '使用简单字符串匹配将本地路径映射到云端路径',
+    regexPre: '预处理（同步前）',
+    regexPost: '后处理（同步后 / 结果）',
+    localPath: '本地路径',
+    cloudPath: '云端路径',
+    pattern: '模式',
+    replace: '替换',
+    saveRules: '保存规则',
+    noRules: '尚未定义规则。',
+  },
+  backup: {
+    title: '备份保留',
+    enable: '启用备份',
+    enableDesc: '在更改前创建副本',
+    maxVersions: '保留的最大版本数：',
+    noAutoDelete: '不自动删除',
+    autoDelete: '自动删除最旧版本',
+  },
+  schedule: {
+    title: '定时任务',
+    cron: 'Cron',
+    daily: '每日',
+    weekly: '每周',
+    weekdaysNarrow: {
+      0: '日',
+      1: '一',
+      2: '二',
+      3: '三',
+      4: '四',
+      5: '五',
+      6: '六',
+    },
+    enableCron: '启用 Cron 计划',
+    enableDaily: '启用每日运行',
+    enableWeekly: '启用每周运行',
+    watchLocal: '监听本地更改',
+    watchDesc: '本地播放列表更新时自动同步',
+    schedule: '计划',
+    notConfigured: '未配置',
+    today: '今天',
+    tomorrow: '明天',
+  },
+  connection: {
+    titleConnected: '服务器已连接',
+    titleConnect: '连接 Plex 服务器',
+    serverDetails: '服务器详情',
+    authentication: '认证',
+    protocol: '协议',
+    address: 'IP 地址或域名',
+    port: '端口',
+    token: 'X-Plex-Token（可选）',
+    username: '用户名 / 邮箱',
+    password: '密码',
+    advanced: '高级选项',
+    timeout: '连接超时（秒）',
+    connectBtn: '连接服务器',
+    connecting: '连接中...',
+    connectedSuccess: '连接成功',
+    selectLibrary: '选择要同步的媒体库',
+  },
+  toasts: {
+    localRefreshCancelled: '本地刷新已取消。',
+    cloudRefreshCancelled: '云端刷新已取消。',
+    strategySaved: '已保存选择的策略“{strategy}”。',
+    strategySaveFailed: '保存同步策略失败。',
+    mappingSaved: '已保存路径映射规则。',
+    mappingSaveFailed: '保存路径映射规则失败。',
+    backupSaved: '已保存备份设置。',
+    backupFailed: '保存备份设置失败。',
+    scheduleDisabled: '已禁用定时任务。',
+    scheduleEmpty: '已禁用定时任务（Cron 为空）。',
+    scheduleStarted: '定时任务更新成功。',
+    scheduleFailed: '更新定时任务失败。',
+    syncFailed: '同步失败。请检查连接。',
+    backgroundSyncSuccess: '后台同步已成功完成。',
+    backgroundSyncFailed: '后台同步失败：{error}',
+    librarySwitched: '媒体库已切换为 {library}',
+    connectedTo: '已成功连接到 {name}',
+    connectionCancelled: '用户已取消连接。',
+    librarySaveFailed: '保存媒体库选择失败。',
+  },
+};

frontend/services/api.ts

@@ -1,4 +1,4 @@
-import { Playlist, ServerType, ApiResponse, PlexServerConnection, PlexConnectionSettings, PlexLibrary, ReplacementRule, PathMappingConfig, PathMappingMode, PathMappingRules, SyncStrategy, ScheduleSettings } from '../types';
+import { Playlist, ServerType, ApiResponse, PlexServerConnection, PlexConnectionSettings, PlexLibrary, ReplacementRule, PathMappingConfig, PathMappingMode, PathMappingRules, SyncStrategy, ScheduleSettings, BackupSettings } from '../types';
 
 const API_BASE = import.meta.env.VITE_API_BASE_URL || '';
 
@@ -38,7 +38,7 @@ const mapPlaylist = (item: any): Playlist => ({
 const mapLibrary = (item: any): PlexLibrary => ({
   id: item.id ?? item.title,
   title: item.title ?? item.id,
-  type: item.type ?? 'artist',
+  type: item.type || item.libraryType || item.library_type || item.section?.type || '',
 });
 
 // Helper function to map raw rules array to ReplacementRule[]
@@ -234,4 +234,31 @@ export const apiService = {
     const response = await fetch(`${API_BASE}/api/sync/status`);
     return handleResponse(response);
   },
+
+  async getBackupSettings(): Promise<ApiResponse<BackupSettings>> {
+    const response = await fetch(`${API_BASE}/api/backup/settings`);
+    const result = await handleResponse<any>(response);
+    if (result.status === 'success') {
+      return {
+        status: 'success',
+        data: {
+          enabled: result.data.enabled ?? false,
+          retentionCount: result.data.retention_count ?? 5,
+        },
+      };
+    }
+    return result as ApiResponse<BackupSettings>;
+  },
+
+  async saveBackupSettings(settings: BackupSettings): Promise<ApiResponse<null>> {
+    const response = await fetch(`${API_BASE}/api/backup/settings`, {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        enabled: settings.enabled,
+        retention_count: settings.retentionCount,
+      }),
+    });
+    return handleResponse(response);
+  },
 };

frontend/translations.ts

@@ -0,0 +1,14 @@
+import { en } from './locales/en';
+import { es } from './locales/es';
+import { zh as chs } from './locales/zh';
+import { cht } from './locales/cht';
+
+export const translations = {
+  en,
+  es,
+  chs,
+  cht,
+};
+
+export type Language = keyof typeof translations;
+export type TranslationStructure = typeof en;

frontend/types.ts

@@ -58,6 +58,11 @@ export interface PathMappingConfig {
   regex: PathMappingRules;
 }
 
+export interface BackupSettings {
+  enabled: boolean;
+  retentionCount: number;
+}
+
 export interface RegexReplacement {
   id: string;
   pattern: string;

sample-front-end/App.tsx

@@ -1,5 +1,6 @@
+
 import React, { useEffect, useState, useCallback, useRef } from 'react';
-import { Playlist, ServerType, SyncStrategy, PlexServerConnection, PathMappingConfig, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode } from './types';
+import { Playlist, ServerType, SyncStrategy, PlexServerConnection, PathMappingConfig, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode, BackupSettings } from './types';
 import { apiService } from './services/api';
 import { 
   STRIPE_BASE_SPEED,
@@ -15,7 +16,8 @@ import { SYNC_BANNER_PADDING_X, SYNC_BANNER_PADDING_Y, SYNC_BANNER_MIN_WIDTH } f
 import ServerPanel from './components/ServerPanel';
 import StrategySelector from './components/StrategySelector';
 import ConnectionModal from './components/ConnectionModal';
-import { ArrowLeftRight, ShieldCheck, X, Server, ServerOff, Clock, Eye, EyeOff, Type, Code2 } from 'lucide-react';
+import { ArrowLeftRight, ShieldCheck, X, Server, ServerOff, Clock, Eye, EyeOff, Type, Code2, Archive, Languages } from 'lucide-react';
+import { useLanguage } from './LanguageContext';
 
 interface Toast {
   id: number;
@@ -112,6 +114,7 @@ const useStripeAnimation = (syncState: SyncState) => {
 };
 
 const App: React.FC = () => {
+  const { t, language, setLanguage } = useLanguage();
   const [localPlaylists, setLocalPlaylists] = useState<Playlist[]>([]);
   const [cloudPlaylists, setCloudPlaylists] = useState<Playlist[]>([]);
   const [cloudServerInfo, setCloudServerInfo] = useState<PlexServerConnection | undefined>(undefined);
@@ -131,6 +134,7 @@ const App: React.FC = () => {
 
   // Connection Modal State
   const [isConnectionModalOpen, setIsConnectionModalOpen] = useState(false);
+  const [isLangMenuOpen, setIsLangMenuOpen] = useState(false);
 
   // Strategy State
   const [currentStrategy, setCurrentStrategy] = useState<SyncStrategy>(SyncStrategy.LOCAL_OVERWRITE);
@@ -157,6 +161,12 @@ const App: React.FC = () => {
     autoWatch: false
   });
 
+  // Backup State
+  const [backupSettings, setBackupSettings] = useState<BackupSettings>({
+    enabled: false,
+    retentionCount: 5
+  });
+
   // Toast Notification System
   const [toasts, setToasts] = useState<Toast[]>([]);
   const timeoutsRef = useRef<{[key: number]: ReturnType<typeof setTimeout>}>({});
@@ -244,7 +254,7 @@ const App: React.FC = () => {
       localAbortRef.current.abort();
       localAbortRef.current = null;
       setLoadingLocal(false);
-      addToast("Local refresh cancelled.");
+      addToast(t('toasts.localRefreshCancelled'));
     }
   };
 
@@ -278,7 +288,7 @@ const App: React.FC = () => {
       cloudAbortRef.current.abort();
       cloudAbortRef.current = null;
       setLoadingCloud(false);
-      addToast("Cloud refresh cancelled.");
+      addToast(t('toasts.cloudRefreshCancelled'));
     }
   };
 
@@ -296,13 +306,24 @@ const App: React.FC = () => {
   // Handle Strategy Change
   const handleStrategyChange = (strategy: SyncStrategy, label: string) => {
     setCurrentStrategy(strategy);
-    addToast(`Selected strategy "${label}" has been saved.`);
+    addToast(t('toasts.strategySaved', { strategy: label }));
   };
 
   // Handle Path Mapping Save
   const handleSavePathMapping = (config: PathMappingConfig) => {
     setPathMappingConfig(config);
-    addToast('Path mapping rules have been saved.');
+    addToast(t('toasts.mappingSaved'));
+  };
+
+  // Handle Backup Settings Save
+  const handleSaveBackupSettings = async (settings: BackupSettings) => {
+    const result = await apiService.saveBackupSettings(settings);
+    if (result.status === 'success') {
+      setBackupSettings(settings);
+      addToast(t('toasts.backupSaved'));
+    } else {
+      addToast(t('toasts.backupFailed'));
+    }
   };
 
   // Handle Schedule Save
@@ -315,15 +336,15 @@ const App: React.FC = () => {
        setScheduleSettings(settings);
 
        if (settings.mode === ScheduleMode.DISABLED) {
-          addToast("Scheduled tasks disabled.");
+          addToast(t('toasts.scheduleDisabled'));
        } else if (settings.mode === ScheduleMode.CRON && settings.cronExpression.trim() === '') {
-          addToast("Scheduled tasks disabled (Empty Cron).");
+          addToast(t('toasts.scheduleEmpty'));
        } else {
-          addToast("Scheduled task started successfully.");
+          addToast(t('toasts.scheduleStarted'));
        }
        return true;
     } else {
-       addToast(result.message || "Failed to update schedule.");
+       addToast(result.message || t('toasts.scheduleFailed'));
        return false;
     }
   };
@@ -358,7 +379,7 @@ const App: React.FC = () => {
 
     } else {
       setSyncState(SyncState.ERROR);
-      addToast("Sync failed. Please check connection.");
+      addToast(t('toasts.syncFailed'));
       setTimeout(() => setSyncState(SyncState.IDLE), SYNC_ERROR_RESET_MS);
     }
   };
@@ -391,21 +412,21 @@ const App: React.FC = () => {
   // Helper: Calculate Next Run Info
   const getScheduleDisplayInfo = (settings: ScheduleSettings) => {
     const result = { 
-        label: 'Schedule', 
-        value: 'Not configured', 
+        label: t('schedule.schedule'), 
+        value: t('schedule.notConfigured'), 
         active: false,
         autoWatch: settings.autoWatch 
     };
 
     if (settings.mode === ScheduleMode.DISABLED) {
-      result.label = 'Auto-Sync';
-      result.value = 'Disabled';
+      result.label = t('dashboard.autoSync');
+      result.value = t('common.disabled');
       return result;
     }
 
     if (settings.mode === ScheduleMode.CRON) {
-      result.label = 'Cron Schedule';
-      result.value = settings.cronExpression || 'Pending...';
+      result.label = t('schedule.cron');
+      result.value = settings.cronExpression || t('server.waiting');
       result.active = true;
       return result;
     }
@@ -435,8 +456,8 @@ const App: React.FC = () => {
        const activeDays = [...settings.weeklyDays].sort();
        
        if (activeDays.length === 0) {
-           result.label = 'Weekly Schedule';
-           result.value = 'No days selected';
+           result.label = t('schedule.weekly');
+           result.value = t('common.none');
            return result;
        }
 
@@ -470,12 +491,12 @@ const App: React.FC = () => {
        const isTomorrow = new Date(now.getTime() + 86400000).getDate() === nextRun.getDate();
        
        let dateStr = '';
-       if (isToday) dateStr = 'Today';
-       else if (isTomorrow) dateStr = 'Tomorrow';
+       if (isToday) dateStr = t('schedule.today');
+       else if (isTomorrow) dateStr = t('schedule.tomorrow');
        else dateStr = days[nextRun.getDay()];
 
-       result.label = `${settings.mode === ScheduleMode.DAILY ? 'Daily' : 'Weekly'} Schedule`;
-       result.value = `${dateStr} at ${timeStr}`;
+       result.label = settings.mode === ScheduleMode.DAILY ? t('schedule.daily') : t('schedule.weekly');
+       result.value = `${dateStr} @ ${timeStr}`;
        result.active = true;
        return result;
     }
@@ -492,6 +513,7 @@ const App: React.FC = () => {
     let Icon = Type;
 
     if (config.mode === PathMappingMode.SIMPLE) {
+        modeLabel = t('common.none').replace('None', 'Simple'); // Fallback hack if simple not in dict, but it is in mapping
         modeLabel = 'Simple';
         count = config.simple.length;
         Icon = Type;
@@ -506,15 +528,15 @@ const App: React.FC = () => {
 
     if (count === 0) {
         return {
-            label: 'Path Mapping',
-            value: 'Not Set',
+            label: t('dashboard.mapping'),
+            value: t('dashboard.notSet'),
             active: false,
             Icon: Icon
         };
     }
 
     return {
-        label: 'Path Mapping',
+        label: t('dashboard.mapping'),
         value: `${modeLabel} (${count})`,
         active: true,
         Icon: Icon
@@ -523,6 +545,24 @@ const App: React.FC = () => {
 
   const pathMappingInfo = getPathMappingDisplayInfo(pathMappingConfig);
 
+  // Helper: Calculate Backup Info
+  const getBackupDisplayInfo = (settings: BackupSettings) => {
+    if (!settings.enabled) {
+        return {
+            label: t('dashboard.backup'),
+            value: t('common.disabled'),
+            active: false
+        };
+    }
+    return {
+        label: t('dashboard.backup'),
+        value: t('dashboard.keep', { count: settings.retentionCount }),
+        active: true
+    };
+  };
+
+  const backupInfo = getBackupDisplayInfo(backupSettings);
+
   return (
     <div className="min-h-screen flex flex-col bg-gray-900 text-gray-100 font-sans overflow-hidden bg-[radial-gradient(ellipse_at_top,_var(--tw-gradient-stops))] from-gray-800 via-gray-900 to-black">
       
@@ -594,45 +634,82 @@ const App: React.FC = () => {
                    <ArrowLeftRight size={24} strokeWidth={2.5} />
                 </div>
                 <h1 className="text-xl font-bold tracking-tight text-white">
-                  Plex<span className="text-plex-orange">Sync</span>
+                  <span className="text-plex-orange">PMS</span> Playlist Sync
                 </h1>
               </div>
               
               {/* Normal Toolbar Right */}
               <div className="flex items-center gap-4">
-                  {/* Path Mapping Info */}
-                  <div className="flex flex-col items-end hidden md:flex border-r border-gray-700/50 pr-4 mr-1">
-                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
-                       {pathMappingInfo.label}
-                     </span>
-                     <div className={`text-xs font-mono flex items-center gap-1.5 ${pathMappingInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
-                        {pathMappingInfo.active && <pathMappingInfo.Icon size={12} />}
-                        <span>{pathMappingInfo.value}</span>
-                     </div>
+                  
+                  {/* Unified Status Dock */}
+                  <div className="hidden md:flex items-center bg-gray-900/40 border border-gray-700/50 rounded-lg p-1 mr-2 backdrop-blur-sm shadow-sm transition-all hover:bg-gray-900/60 hover:border-gray-600/50">
+                      
+                      {/* Path Mapping Section */}
+                      <div className="flex flex-col px-3 py-0.5 border-r border-gray-700/30 min-w-[90px] group/item">
+                         <span className="text-[9px] font-bold text-gray-500 uppercase tracking-widest group-hover/item:text-gray-400 transition-colors">{pathMappingInfo.label}</span>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium ${pathMappingInfo.active ? 'text-blue-400' : 'text-gray-600'}`}>
+                            <pathMappingInfo.Icon size={12} strokeWidth={2.5} />
+                            <span className="truncate">{pathMappingInfo.value}</span>
+                         </div>
+                      </div>
+
+                      {/* Backup Section */}
+                      <div className="flex flex-col px-3 py-0.5 border-r border-gray-700/30 min-w-[90px] group/item">
+                         <span className="text-[9px] font-bold text-gray-500 uppercase tracking-widest group-hover/item:text-gray-400 transition-colors">{backupInfo.label}</span>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium ${backupInfo.active ? 'text-indigo-400' : 'text-gray-600'}`}>
+                            <Archive size={12} strokeWidth={2.5} />
+                            <span>{backupInfo.active ? t('dashboard.retain', { count: backupSettings.retentionCount }) : backupInfo.value}</span>
+                         </div>
+                      </div>
+
+                      {/* Schedule Section */}
+                      <div className="flex flex-col px-3 py-0.5 min-w-[140px] group/item">
+                         <div className="flex items-center justify-between">
+                            <span className="text-[9px] font-bold text-gray-500 uppercase tracking-widest group-hover/item:text-gray-400 transition-colors">{t('dashboard.autoSync')}</span>
+                            {/* Watch Indicator Badge */}
+                            <div 
+                                className={`flex items-center gap-1 px-1 rounded-[2px] transition-colors ${scheduleInfo.autoWatch ? 'text-plex-orange bg-plex-orange/10' : 'text-gray-700 bg-gray-800'}`}
+                                title={scheduleInfo.autoWatch ? t('dashboard.watchModeActive') : t('dashboard.watchModeDisabled')}
+                            >
+                                {scheduleInfo.autoWatch ? <Eye size={9} /> : <EyeOff size={9} />}
+                                <span className="text-[8px] font-bold uppercase">{t('dashboard.watch')}</span>
+                            </div>
+                         </div>
+                         <div className={`flex items-center gap-1.5 text-xs font-medium mt-0.5 ${scheduleInfo.active ? 'text-green-400' : 'text-gray-600'}`}>
+                            <Clock size={12} strokeWidth={2.5} />
+                            <span className="truncate max-w-[120px]">{scheduleInfo.active ? scheduleInfo.value : t('common.disabled')}</span>
+                         </div>
+                      </div>
                   </div>
 
-                  {/* Schedule Info */}
-                  <div className="flex flex-col items-end mr-2 md:mr-0 hidden md:flex">
-                     <span className="text-[10px] uppercase font-bold text-gray-500 tracking-wider">
-                       {scheduleInfo.label}
-                     </span>
-                     <div className="text-xs font-mono flex items-center gap-1.5">
-                       {/* Schedule Part */}
-                       <div className={`flex items-center gap-1.5 ${scheduleInfo.active ? 'text-plex-orange' : 'text-gray-600'}`}>
-                          {scheduleInfo.active && <Clock size={12} />}
-                          <span>{scheduleInfo.value}</span>
-                       </div>
-
-                       {/* Watch Part */}
-                       <span className="text-gray-700 mx-0.5">|</span>
-                       <div 
-                         className={`flex items-center gap-1 ${scheduleInfo.autoWatch ? 'text-plex-orange' : 'text-gray-600'}`} 
-                         title={scheduleInfo.autoWatch ? "Local Playlist Monitoring Enabled" : "Local Playlist Monitoring Disabled"}
-                       >
-                           {scheduleInfo.autoWatch ? <Eye size={12} /> : <EyeOff size={12} />}
-                           <span className="text-[10px] font-sans font-bold">WATCH</span>
-                       </div>
-                     </div>
+                  {/* Language Switcher */}
+                  <div className="relative">
+                    <button
+                      onClick={() => setIsLangMenuOpen(!isLangMenuOpen)}
+                      className="flex items-center justify-center w-9 h-9 rounded-full border border-gray-700 bg-gray-800/50 text-gray-400 hover:text-white hover:bg-gray-700 transition-all"
+                      title="Switch Language"
+                    >
+                      <Languages size={18} />
+                    </button>
+                    {isLangMenuOpen && (
+                      <>
+                        <div className="fixed inset-0 z-40" onClick={() => setIsLangMenuOpen(false)}></div>
+                        <div className="absolute right-0 top-full mt-2 w-32 bg-gray-800 border border-gray-700 rounded-lg shadow-xl z-50 overflow-hidden">
+                          <button 
+                            onClick={() => { setLanguage('en'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'en' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            English
+                          </button>
+                          <button 
+                            onClick={() => { setLanguage('es'); setIsLangMenuOpen(false); }}
+                            className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'es' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
+                          >
+                            Español
+                          </button>
+                        </div>
+                      </>
+                    )}
                   </div>
 
                   {/* Connection Status Button */}
@@ -643,7 +720,7 @@ const App: React.FC = () => {
                         ? "bg-green-500/10 border-green-500/50 text-green-400 hover:bg-green-500/20 hover:shadow-green-500/20"
                         : "bg-red-500/10 border-red-500/50 text-red-400 hover:bg-red-500/20 hover:shadow-red-500/20"
                       }`}
-                    title={isConnected ? "Connected to Plex" : "Disconnected"}
+                    title={isConnected ? t('dashboard.connected') : t('dashboard.disconnected')}
                   >
                     {isConnected ? <Server size={18} /> : <ServerOff size={18} />}
                   </button>
@@ -660,7 +737,7 @@ const App: React.FC = () => {
                  }}
                >
                   <h1 className={`text-xl md:text-2xl font-black tracking-[0.2em] uppercase whitespace-nowrap transition-colors duration-300 ${syncState === SyncState.SUCCESS ? 'text-[#22c55e]' : 'text-[#F59E0B]'}`}>
-                    {syncState === SyncState.SYNCING ? 'SYNCHRONIZING' : 'SYNC COMPLETE'}
+                    {syncState === SyncState.SYNCING ? t('dashboard.synchronizing') : t('dashboard.syncComplete')}
                   </h1>
                </div>
             </div>
@@ -719,6 +796,8 @@ const App: React.FC = () => {
                 onSelect={handleStrategyChange}
                 savedPathMapping={pathMappingConfig}
                 onSavePathMapping={handleSavePathMapping}
+                savedBackup={backupSettings}
+                onSaveBackup={handleSaveBackupSettings}
                 savedSchedule={scheduleSettings}
                 onSaveSchedule={handleSaveSchedule}
                 syncState={syncState}
@@ -743,7 +822,7 @@ const App: React.FC = () => {
       
       {/* Footer */}
       <footer className="flex-none py-4 text-center text-xs text-gray-600 border-t border-white/5 bg-gray-900/50 backdrop-blur">
-        <p>&copy; {new Date().getFullYear()} PlexSync Manager. Connected to Docker backend.</p>
+        <p>{t('app.footer', { year: new Date().getFullYear() })}</p>
       </footer>
 
       {/* Modals */}
@@ -757,4 +836,4 @@ const App: React.FC = () => {
   );
 };
 
-export default App;
+export default App;

sample-front-end/LanguageContext.tsx

@@ -0,0 +1,64 @@
+
+import React, { createContext, useContext, useState, useEffect, ReactNode } from 'react';
+import { translations, Language, TranslationStructure } from './translations';
+
+interface LanguageContextProps {
+  language: Language;
+  setLanguage: (lang: Language) => void;
+  t: (path: string, params?: Record<string, string | number>) => string;
+}
+
+const LanguageContext = createContext<LanguageContextProps | undefined>(undefined);
+
+export const LanguageProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
+  const [language, setLanguageState] = useState<Language>('en');
+
+  useEffect(() => {
+    const savedLang = localStorage.getItem('plexsync-language') as Language;
+    if (savedLang && translations[savedLang]) {
+      setLanguageState(savedLang);
+    }
+  }, []);
+
+  const setLanguage = (lang: Language) => {
+    setLanguageState(lang);
+    localStorage.setItem('plexsync-language', lang);
+  };
+
+  const t = (path: string, params?: Record<string, string | number>): string => {
+    const keys = path.split('.');
+    let current: any = translations[language];
+
+    for (const key of keys) {
+      if (current[key] === undefined) {
+        console.warn(`Missing translation for key: ${path} in language: ${language}`);
+        return path;
+      }
+      current = current[key];
+    }
+
+    let text = current as string;
+
+    if (params) {
+      Object.entries(params).forEach(([key, value]) => {
+        text = text.replace(`{${key}}`, String(value));
+      });
+    }
+
+    return text;
+  };
+
+  return (
+    <LanguageContext.Provider value={{ language, setLanguage, t }}>
+      {children}
+    </LanguageContext.Provider>
+  );
+};
+
+export const useLanguage = () => {
+  const context = useContext(LanguageContext);
+  if (!context) {
+    throw new Error('useLanguage must be used within a LanguageProvider');
+  }
+  return context;
+};

sample-front-end/components/ConnectionModal.tsx

@@ -3,6 +3,7 @@ import React, { useState, useEffect, useRef } from 'react';
 import { PlexConnectionSettings, PlexServerConnection, PlexLibrary } from '../types';
 import { apiService } from '../services/api';
 import { X, Server, Lock, User, Key, Globe, Eye, EyeOff, CheckCircle, Library, ChevronDown, ChevronRight, Settings, Loader2 } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 interface ConnectionModalProps {
   isOpen: boolean;
@@ -12,6 +13,7 @@ interface ConnectionModalProps {
 }
 
 const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onConnectSuccess, onShowMessage }) => {
+  const { t } = useLanguage();
   const [formData, setFormData] = useState<PlexConnectionSettings>({
     protocol: 'http',
     address: '',
@@ -71,7 +73,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
        const updatedInfo = { ...connectedServerInfo, libraryName: lib.title };
        setConnectedServerInfo(updatedInfo);
        onConnectSuccess(updatedInfo);
-       onShowMessage(`Library switched to ${lib.title}`);
+       onShowMessage(t('toasts.librarySwitched', { library: lib.title }));
     }
   };
 
@@ -90,7 +92,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
         abortControllerRef.current.abort();
         abortControllerRef.current = null;
         setIsConnecting(false);
-        setError("Connection cancelled by user.");
+        setError(t('toasts.connectionCancelled'));
       }
       return;
     }
@@ -119,7 +121,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
       const info = result.data.serverInfo;
       setConnectedServerInfo(info);
-      onShowMessage(`Successfully connected to ${info.name || 'Plex Server'}`);
+      onShowMessage(t('toasts.connectedTo', { name: info.name || 'Plex Server' }));
       
       const libs = info.libraries || [];
       setLibraries(libs);
@@ -134,7 +136,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
           onConnectSuccess(info);
       }
     } else {
-      setError(result.message || "Connection failed");
+      setError(result.message || t('server.connectionFailed'));
     }
   };
 
@@ -154,7 +156,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
         <div className="px-6 py-4 bg-gray-800 border-b border-gray-700 flex items-center justify-between flex-none">
           <h3 className="text-lg font-semibold text-white flex items-center gap-2">
             <Server size={18} className={isConnected ? "text-green-400" : "text-plex-orange"} />
-            {isConnected ? 'Server Connected' : 'Connect Plex Server'}
+            {isConnected ? t('connection.titleConnected') : t('connection.titleConnect')}
           </h3>
           <button onClick={onClose} className="text-gray-400 hover:text-white transition-colors">
             <X size={20} />
@@ -173,7 +175,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
             {/* Server Connection */}
             <div className="space-y-3">
-                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">Server Details</label>
+                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">{t('connection.serverDetails')}</label>
                 <div className="grid grid-cols-4 gap-3">
                 <div className="col-span-1">
                     <select
@@ -197,7 +199,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                         name="address"
                         required
                         disabled={isConnected || isConnecting}
-                        placeholder="IP Address or Domain"
+                        placeholder={t('connection.address')}
                         value={formData.address}
                         onChange={handleChange}
                         className={`w-full h-10 pl-9 pr-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -211,7 +213,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     type="text" 
                     name="port"
                     disabled={isConnected || isConnecting}
-                    placeholder="Port (e.g. 32400)"
+                    placeholder={t('connection.port')}
                     value={formData.port}
                     onChange={handleChange}
                     className={`w-full h-10 px-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -223,7 +225,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
 
             {/* Authentication */}
             <div className="space-y-3">
-                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">Authentication</label>
+                <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider">{t('connection.authentication')}</label>
                 
                 {/* Token */}
                 <div className="relative">
@@ -234,7 +236,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     type="text" 
                     name="token"
                     disabled={isConnected || isConnecting}
-                    placeholder="X-Plex-Token (Optional)"
+                    placeholder={t('connection.token')}
                     value={formData.token}
                     onChange={handleChange}
                     className={`w-full h-10 pl-9 pr-3 bg-gray-800 border border-gray-600 rounded-md text-sm text-white placeholder-gray-500 focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange transition-all font-mono ${isConnected ? 'opacity-60 cursor-not-allowed' : ''}`}
@@ -256,7 +258,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             type="text" 
                             name="username"
                             disabled={isTokenProvided || isConnecting}
-                            placeholder="Username / Email"
+                            placeholder={t('connection.username')}
                             value={formData.username}
                             onChange={handleChange}
                             className={`w-full h-10 pl-9 pr-3 rounded-md text-sm transition-all focus:outline-none ${disabledInputClass}`}
@@ -272,7 +274,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             type={showPassword ? "text" : "password"} 
                             name="password"
                             disabled={isTokenProvided || isConnecting}
-                            placeholder="Password"
+                            placeholder={t('connection.password')}
                             value={formData.password}
                             onChange={handleChange}
                             className={`w-full h-10 pl-9 pr-10 rounded-md text-sm transition-all focus:outline-none ${disabledInputClass}`}
@@ -300,7 +302,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                 >
                   <div className="flex items-center gap-2">
                     <Settings size={14} />
-                    <span>Advanced Options</span>
+                    <span>{t('connection.advanced')}</span>
                   </div>
                   {showAdvanced ? <ChevronDown size={14} /> : <ChevronRight size={14} />}
                 </button>
@@ -308,7 +310,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                 {showAdvanced && (
                   <div className="p-3 bg-gray-900/50 space-y-3 animate-in slide-in-from-top-2">
                     <div>
-                      <label className="text-xs text-gray-500 mb-1 block">Connection Timeout (Seconds)</label>
+                      <label className="text-xs text-gray-500 mb-1 block">{t('connection.timeout')}</label>
                       <input 
                         type="number"
                         min="1"
@@ -337,15 +339,15 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                     {isConnecting ? (
                       <>
                         <Loader2 size={16} className="animate-spin" />
-                        <span>Connecting... <span className="opacity-75 font-normal ml-1">(Cancel)</span></span>
+                        <span>{t('connection.connecting')} <span className="opacity-75 font-normal ml-1">({t('common.cancel')})</span></span>
                       </>
-                    ) : 'Connect Server'}
+                    ) : t('connection.connectBtn')}
                 </button>
             ) : (
                 <div className="mt-2 p-2 bg-green-500/10 border border-green-500/20 rounded-lg text-center">
                     <p className="text-green-400 text-sm font-semibold flex items-center justify-center gap-2">
                         <CheckCircle size={16} />
-                        Connected Successfully
+                        {t('connection.connectedSuccess')}
                     </p>
                 </div>
             )}
@@ -354,7 +356,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
             {/* Library Selection - Appears after connection */}
             {isConnected && libraries.length > 0 && (
                 <div className="mt-6 pt-5 border-t border-gray-700 animate-in slide-in-from-top-2 fade-in">
-                    <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider block mb-2">Select Library to Sync</label>
+                    <label className="text-xs font-semibold text-gray-400 uppercase tracking-wider block mb-2">{t('connection.selectLibrary')}</label>
                     <div className="relative">
                         <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                             <Library size={14} className="text-plex-orange" />
@@ -378,7 +380,7 @@ const ConnectionModal: React.FC<ConnectionModalProps> = ({ isOpen, onClose, onCo
                             onClick={onClose}
                             className="px-6 py-2 bg-gray-700 hover:bg-gray-600 text-white text-sm font-medium rounded-lg transition-colors border border-gray-600 hover:border-gray-500"
                         >
-                            Done
+                            {t('common.done')}
                         </button>
                     </div>
                 </div>

sample-front-end/components/PlaylistCard.tsx

@@ -1,12 +1,15 @@
+
 import React from 'react';
 import { Playlist } from '../types';
 import { Disc3, Clock } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 interface PlaylistCardProps {
   playlist: Playlist;
 }
 
 const PlaylistCard: React.FC<PlaylistCardProps> = ({ playlist }) => {
+  const { t } = useLanguage();
   return (
     <div className="group flex flex-col w-full p-2.5 bg-gray-800/60 rounded-md border border-gray-700/50 hover:bg-gray-700 hover:border-plex-orange/50 transition-all duration-200 cursor-pointer shadow-sm">
       <div className="flex items-center justify-between">
@@ -16,11 +19,11 @@ const PlaylistCard: React.FC<PlaylistCardProps> = ({ playlist }) => {
       </div>
       
       <div className="flex items-center mt-1.5 space-x-4 text-xs text-gray-500 group-hover:text-gray-400">
-        <span className="flex items-center" title="Track Count">
+        <span className="flex items-center" title={t('playlist.trackCount')}>
           <Disc3 size={12} className="mr-1.5 opacity-70" />
           {playlist.trackCount}
         </span>
-        <span className="flex items-center" title="Last Updated">
+        <span className="flex items-center" title={t('playlist.lastUpdated')}>
           <Clock size={12} className="mr-1.5 opacity-70" />
           {new Date(playlist.lastUpdated).toLocaleDateString()}
         </span>
@@ -29,4 +32,4 @@ const PlaylistCard: React.FC<PlaylistCardProps> = ({ playlist }) => {
   );
 };
 
-export default PlaylistCard;
+export default PlaylistCard;

sample-front-end/components/ServerPanel.tsx

@@ -3,6 +3,7 @@ import React from 'react';
 import { Playlist, ServerType, PlexServerConnection } from '../types';
 import PlaylistCard from './PlaylistCard';
 import { RefreshCw, Server, Cloud, WifiOff, X } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 interface ServerPanelProps {
   type: ServerType;
@@ -14,6 +15,7 @@ interface ServerPanelProps {
 }
 
 const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, onRefresh, onCancel, serverInfo }) => {
+  const { t } = useLanguage();
   const isLocal = type === ServerType.LOCAL;
   
   let Icon = isLocal ? Server : Cloud;
@@ -28,17 +30,17 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
   let displaySubtitle: React.ReactNode = null;
 
   if (isLocal) {
-    displayTitle = 'Local Server';
+    displayTitle = t('server.local');
     displaySubtitle = (
       <p className="text-xs text-gray-400 font-medium mt-0.5 md:mt-0 md:ml-0">
-        {playlists.length} Playlists
+        {t('server.playlists', { count: playlists.length })}
       </p>
     );
   } else {
     // Cloud Logic
     if (serverInfo) {
       if (serverInfo.isConnected) {
-        displayTitle = serverInfo.name || 'Cloud Server';
+        displayTitle = serverInfo.name || t('server.cloud');
         displaySubtitle = (
            <div className="flex items-center text-xs text-gray-300 font-medium space-x-1.5 truncate mt-0.5 md:mt-0">
               <span className="text-plex-orange truncate font-semibold">{serverInfo.libraryName}</span>
@@ -47,20 +49,20 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
            </div>
         );
       } else {
-        displayTitle = 'Not Connected';
+        displayTitle = t('server.notConnected');
         Icon = WifiOff;
         headerColor = 'text-red-400';
         displaySubtitle = (
           <p className="text-xs text-gray-500 font-medium mt-0.5">
-             Connection failed
+             {t('server.connectionFailed')}
           </p>
         );
       }
     } else {
-      displayTitle = 'Cloud Server';
+      displayTitle = t('server.cloud');
       displaySubtitle = (
         <p className="text-xs text-gray-500 font-medium mt-0.5">
-           {isLoading ? 'Connecting...' : 'Waiting...'}
+           {isLoading ? t('server.connecting') : t('server.waiting')}
         </p>
       );
     }
@@ -121,7 +123,7 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
                : 'text-gray-400 hover:text-white hover:bg-white/10'
              }
           `}
-          title={isLoading ? "Cancel Refresh" : "Refresh Playlists"}
+          title={isLoading ? t('server.cancelRefresh') : t('server.refreshPlaylists')}
         >
           {isLoading ? (
             <div className="relative flex items-center justify-center">
@@ -141,11 +143,11 @@ const ServerPanel: React.FC<ServerPanelProps> = ({ type, playlists, isLoading, o
         {isLoading && playlists.length === 0 ? (
           <div className="flex flex-col items-center justify-center h-full text-gray-500 space-y-3">
             <RefreshCw size={24} className="animate-spin text-plex-orange/50" />
-            <p className="text-xs font-medium tracking-wide uppercase">Syncing...</p>
+            <p className="text-xs font-medium tracking-wide uppercase">{t('server.syncing')}</p>
           </div>
         ) : playlists.length === 0 ? (
           <div className="flex flex-col items-center justify-center h-full text-gray-500">
-            <p className="text-sm">No playlists found.</p>
+            <p className="text-sm">{t('server.noPlaylists')}</p>
           </div>
         ) : (
           <div className="space-y-2.5 md:space-y-3">

sample-front-end/components/StrategySelector.tsx

@@ -1,5 +1,6 @@
+
 import React, { useState, useRef, useEffect } from 'react';
-import { SyncStrategy, ReplacementRule, PathMappingConfig, PathMappingRules, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode } from '../types';
+import { SyncStrategy, ReplacementRule, PathMappingConfig, PathMappingRules, PathMappingMode, SyncState, ScheduleSettings, ScheduleMode, BackupSettings } from '../types';
 import { 
   ArrowRightCircle, 
   ArrowLeftCircle, 
@@ -16,16 +17,19 @@ import {
   Calendar,
   Clock,
   Repeat,
-  CheckSquare,
-  Square,
   Type,
-  Code2
+  Code2,
+  Link,
+  Archive,
+  History,
+  Eye
 } from 'lucide-react';
+import { useLanguage } from '../LanguageContext';
 
 interface StrategyOption {
   value: SyncStrategy;
-  label: string;
-  description: string;
+  labelKey: string;
+  descKey: string;
   icon: React.ElementType;
   color: string;
 }
@@ -33,29 +37,29 @@ interface StrategyOption {
 const STRATEGIES: StrategyOption[] = [
   {
     value: SyncStrategy.LOCAL_OVERWRITE,
-    label: 'Local Overwrite',
-    description: 'Local playlist completely overwrites Cloud. (No Diff)',
+    labelKey: 'strategies.localOverwrite.label',
+    descKey: 'strategies.localOverwrite.desc',
     icon: ArrowRightCircle,
     color: 'text-blue-400'
   },
   {
     value: SyncStrategy.CLOUD_OVERWRITE,
-    label: 'Cloud Overwrite',
-    description: 'Cloud playlist completely overwrites Local. (No Diff)',
+    labelKey: 'strategies.cloudOverwrite.label',
+    descKey: 'strategies.cloudOverwrite.desc',
     icon: ArrowLeftCircle,
     color: 'text-green-400'
   },
   {
     value: SyncStrategy.MERGE_LOCAL,
-    label: 'Two-way Merge (Local Priority)',
-    description: 'Merge both. Conflicts resolve to Local version.',
+    labelKey: 'strategies.mergeLocal.label',
+    descKey: 'strategies.mergeLocal.desc',
     icon: GitMerge,
     color: 'text-blue-300'
   },
   {
     value: SyncStrategy.MERGE_CLOUD,
-    label: 'Two-way Merge (Cloud Priority)',
-    description: 'Merge both. Conflicts resolve to Cloud version.',
+    labelKey: 'strategies.mergeCloud.label',
+    descKey: 'strategies.mergeCloud.desc',
     icon: GitMerge,
     color: 'text-green-300'
   }
@@ -90,17 +94,12 @@ const MAPPING_THEME = {
 const deriveEffectiveSchedule = (schedule: ScheduleSettings, tab: ScheduleMode): ScheduleSettings => {
   const derived = { ...schedule };
   
-  if (tab === ScheduleMode.CRON) {
-     derived.mode = derived.cronExpression.trim() !== '' ? ScheduleMode.CRON : ScheduleMode.DISABLED;
+  // Unified logic: If the mode matches the tab, we keep it (Enabled).
+  // If the mode doesn't match (e.g. it was DISABLED), then in the context of this tab, it remains Disabled until the user toggles the switch.
+  if (derived.mode === tab) {
+    derived.mode = tab;
   } else {
-    // For Daily/Weekly
-    // If the mode matches the tab, we keep it (Enabled).
-    // If the mode doesn't match (e.g. it was CRON or DISABLED), then in the context of this tab, it is effectively Disabled until the user checks the box.
-    if (derived.mode === tab) {
-      derived.mode = tab;
-    } else {
-      derived.mode = ScheduleMode.DISABLED;
-    }
+    derived.mode = ScheduleMode.DISABLED;
   }
   return derived;
 };
@@ -119,6 +118,7 @@ interface MappingGroupEditorProps {
   rightPlaceholder?: string;
   leftInputClass?: string;
   rightInputClass?: string;
+  t: (key: string) => string;
 }
 
 const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({ 
@@ -129,10 +129,11 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
   isLocked,
   borderColor = "border-gray-700",
   bgColor = "bg-gray-900/50",
-  leftPlaceholder = "Pattern",
-  rightPlaceholder = "Replace",
+  leftPlaceholder,
+  rightPlaceholder,
   leftInputClass,
-  rightInputClass
+  rightInputClass,
+  t
 }) => {
   
   const handleAdd = () => {
@@ -165,7 +166,7 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
            onClick={handleAdd}
            disabled={isLocked}
            className="p-1 rounded bg-gray-700/50 hover:bg-gray-600 text-gray-400 hover:text-white transition-colors"
-           title="Add Rule"
+           title={t('common.add')}
          >
            <Plus size={12} />
          </button>
@@ -174,22 +175,22 @@ const MappingGroupEditor: React.FC<MappingGroupEditorProps> = ({
        <div className="flex-1 space-y-2 overflow-y-auto max-h-32 custom-scrollbar pr-1">
          {rules.length === 0 ? (
            <div className="text-xs text-gray-600 italic text-center py-2 border border-dashed border-gray-700/50 rounded-lg">
-             No rules defined.
+             {t('mapping.noRules')}
            </div>
          ) : (
            rules.map((rule) => (
              <div key={rule.id} className="flex items-center space-x-1 animate-in slide-in-from-left-1 duration-200">
                 <input 
                   type="text" 
-                  placeholder={leftPlaceholder}
+                  placeholder={leftPlaceholder || t('mapping.pattern')}
                   value={rule.search}
                   onChange={(e) => handleUpdate(rule.id, 'search', e.target.value)}
                   className={`flex-1 min-w-0 border rounded px-1.5 py-1 text-xs focus:outline-none transition-colors ${leftInputClass || defaultInputStyle}`}
                 />
-                <ArrowRightCircle size={10} className="text-gray-600 flex-none opacity-50" />
+                <Link size={12} className="text-gray-600 flex-none opacity-50" />
                 <input 
                   type="text" 
-                  placeholder={rightPlaceholder}
+                  placeholder={rightPlaceholder || t('mapping.replace')}
                   value={rule.replace}
                   onChange={(e) => handleUpdate(rule.id, 'replace', e.target.value)}
                   className={`flex-1 min-w-0 border rounded px-1.5 py-1 text-xs focus:outline-none transition-colors ${rightInputClass || defaultInputStyle}`}
@@ -213,6 +214,8 @@ interface StrategySelectorProps {
   onSelect: (strategy: SyncStrategy, label: string) => void;
   savedPathMapping: PathMappingConfig;
   onSavePathMapping: (config: PathMappingConfig) => void;
+  savedBackup: BackupSettings;
+  onSaveBackup: (settings: BackupSettings) => void;
   savedSchedule: ScheduleSettings;
   onSaveSchedule: (settings: ScheduleSettings) => Promise<boolean>;
   syncState: SyncState;
@@ -224,11 +227,14 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   onSelect, 
   savedPathMapping, 
   onSavePathMapping,
+  savedBackup,
+  onSaveBackup,
   savedSchedule,
   onSaveSchedule,
   syncState,
   onSync
 }) => {
+  const { t } = useLanguage();
   const [isOpen, setIsOpen] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
@@ -236,6 +242,10 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   const [localPathMapping, setLocalPathMapping] = useState<PathMappingConfig>(savedPathMapping);
   const [isMappingDirty, setIsMappingDirty] = useState(false);
 
+  // Local state for Backup Settings
+  const [localBackup, setLocalBackup] = useState<BackupSettings>(savedBackup);
+  const [isBackupDirty, setIsBackupDirty] = useState(false);
+
   // Local state for Schedule editing
   const [localSchedule, setLocalSchedule] = useState<ScheduleSettings>(savedSchedule);
   const [isScheduleDirty, setIsScheduleDirty] = useState(false);
@@ -254,6 +264,11 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
     setIsMappingDirty(false);
   }, [savedPathMapping]);
 
+  useEffect(() => {
+    setLocalBackup(JSON.parse(JSON.stringify(savedBackup)));
+    setIsBackupDirty(false);
+  }, [savedBackup]);
+
   useEffect(() => {
     setLocalSchedule(JSON.parse(JSON.stringify(savedSchedule)));
     if (savedSchedule.mode !== ScheduleMode.DISABLED) {
@@ -268,6 +283,12 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
     setIsMappingDirty(isDifferent);
   }, [localPathMapping, savedPathMapping]);
 
+  // Check dirty state for backup
+  useEffect(() => {
+    const isDifferent = JSON.stringify(localBackup) !== JSON.stringify(savedBackup);
+    setIsBackupDirty(isDifferent);
+  }, [localBackup, savedBackup]);
+
   // Check dirty state for Schedule (including Active Tab changes)
   useEffect(() => {
     const effectiveLocal = deriveEffectiveSchedule(localSchedule, activeScheduleTab);
@@ -291,7 +312,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
 
   const handleSelect = (strategy: StrategyOption) => {
     if (isLocked) return;
-    onSelect(strategy.value, strategy.label);
+    onSelect(strategy.value, t(strategy.labelKey));
   };
 
   // --- Path Mapping Handlers ---
@@ -351,6 +372,22 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   const regexRules = localPathMapping.regex;
   const simpleRules = localPathMapping.simple;
 
+  // --- Backup Handlers ---
+  const handleUpdateBackup = (field: keyof BackupSettings, value: any) => {
+    if (isLocked) return;
+    setLocalBackup(prev => ({ ...prev, [field]: value }));
+  };
+
+  const handleResetBackup = () => {
+    if (isLocked) return;
+    setLocalBackup(JSON.parse(JSON.stringify(savedBackup)));
+  };
+
+  const handleSaveBackupClick = () => {
+    if (isLocked) return;
+    onSaveBackup(localBackup);
+  };
+
   // --- Schedule Handlers ---
   const handleUpdateSchedule = (field: keyof ScheduleSettings, value: any) => {
     if (isLocked) return;
@@ -407,7 +444,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
       <button
         onClick={() => setIsOpen(!isOpen)}
         className="flex items-center justify-center w-12 h-12 rounded-full bg-gray-800/90 border border-gray-600 hover:border-plex-orange text-gray-300 hover:text-white hover:bg-gray-700/80 transition-all shadow-2xl hover:shadow-plex-orange/30 ring-[6px] md:ring-8 ring-gray-900 backdrop-blur-sm active:scale-95"
-        title={`Current Strategy: ${selectedOption.label}`}
+        title={`Current Strategy: ${t(selectedOption.labelKey)}`}
       >
         <selectedOption.icon size={22} className={selectedOption.color} strokeWidth={2.5} />
         <div className="absolute -bottom-1 -right-1 bg-gray-900 rounded-full border border-gray-600 p-[2px] shadow-sm">
@@ -433,7 +470,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             
             {/* Section 1: Sync Strategy */}
             <div className="px-4 py-3 bg-black/20 border-b border-white/5 flex-none">
-            <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest mb-2">Sync Strategy</h3>
+            <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest mb-2">{t('strategies.title')}</h3>
             <div className="space-y-1">
                 {STRATEGIES.map((strategy) => (
                 <div
@@ -448,7 +485,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     <div className="flex items-center space-x-3 overflow-hidden">
                     <strategy.icon size={18} className={strategy.color} />
                     <span className={`text-sm font-medium truncate ${currentStrategy === strategy.value ? 'text-white' : 'text-gray-300 group-hover:text-white'}`}>
-                        {strategy.label}
+                        {t(strategy.labelKey)}
                     </span>
                     </div>
                     
@@ -456,7 +493,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     <div className="relative group/tooltip">
                         <HelpCircle size={14} className="text-gray-600 hover:text-gray-400 transition-colors" />
                         <div className="absolute right-0 bottom-full mb-2 w-48 p-2.5 bg-gray-900 text-xs text-gray-300 rounded-lg shadow-xl border border-gray-700 pointer-events-none opacity-0 group-hover/tooltip:opacity-100 transition-opacity z-50">
-                            {strategy.description}
+                            {t(strategy.descKey)}
                         </div>
                     </div>
                     
@@ -469,17 +506,91 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             </div>
             </div>
 
+            {/* Section 1.5: Backup Retention */}
+            <div className="px-4 py-3 bg-gray-900/40 border-b border-white/5 flex-none">
+              <div className="flex items-center justify-between mb-3">
+                 <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('backup.title')}</h3>
+              </div>
+              
+              <div className="flex flex-col space-y-3">
+                 <div className="flex items-center justify-between">
+                    <div className="flex items-center space-x-2">
+                       <div className="p-1.5 rounded-lg bg-indigo-500/10 border border-indigo-500/20 text-indigo-400">
+                          <Archive size={16} />
+                       </div>
+                       <div className="flex flex-col">
+                          <span className="text-sm font-medium text-gray-200">{t('backup.enable')}</span>
+                          <span className="text-[10px] text-gray-500">{t('backup.enableDesc')}</span>
+                       </div>
+                    </div>
+
+                    <button 
+                      onClick={() => handleUpdateBackup('enabled', !localBackup.enabled)}
+                      className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localBackup.enabled ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                    >
+                      <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localBackup.enabled ? 'translate-x-6' : 'translate-x-1'}`} />
+                    </button>
+                 </div>
+                 
+                 {/* Expanded Config */}
+                 <div className={`overflow-hidden transition-all duration-300 ${localBackup.enabled ? 'max-h-20 opacity-100' : 'max-h-0 opacity-50'}`}>
+                    <div className="flex items-center justify-between p-2.5 rounded-lg bg-black/20 border border-white/5">
+                        <div className="flex items-center space-x-2">
+                           <History size={14} className="text-gray-500" />
+                           <span className="text-xs text-gray-400">{t('backup.maxVersions')}</span>
+                        </div>
+                        <div className="flex items-center space-x-2">
+                            <input 
+                               type="number" 
+                               min="1" 
+                               max="100" 
+                               value={localBackup.retentionCount}
+                               onChange={(e) => handleUpdateBackup('retentionCount', parseInt(e.target.value) || 1)}
+                               className="w-16 bg-gray-800 border border-gray-700 text-center text-sm rounded py-1 text-white focus:border-plex-orange focus:outline-none"
+                            />
+                            <span className="text-[10px] text-gray-600 italic">{t('backup.autoDelete')}</span>
+                        </div>
+                    </div>
+                 </div>
+
+                 <div className="flex justify-end items-center gap-2 pt-1">
+                    <button
+                        onClick={handleResetBackup}
+                        disabled={!isBackupDirty}
+                        className={`flex items-center justify-center space-x-1.5 px-3 py-1.5 rounded-md text-xs font-medium border transition-all
+                        ${isBackupDirty 
+                            ? 'bg-gray-800 border-gray-600 text-gray-300 hover:bg-gray-700 hover:text-white' 
+                            : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
+                    >
+                        <RotateCcw size={12} />
+                        <span>{t('common.revert')}</span>
+                    </button>
+                    <button
+                        onClick={handleSaveBackupClick}
+                        disabled={!isBackupDirty}
+                        className={`flex items-center justify-center space-x-1.5 px-3 py-1.5 rounded-md text-xs font-bold border transition-all
+                        ${isBackupDirty 
+                            ? 'bg-plex-orange border-plex-orange text-gray-900 hover:bg-yellow-500 shadow-lg shadow-plex-orange/10' 
+                            : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
+                    >
+                        <Save size={12} />
+                        <span>{t('common.save')}</span>
+                    </button>
+                 </div>
+              </div>
+            </div>
+
             {/* Section 2: Path Mapping (Tabs + Grid) */}
             <div className="p-4 bg-gray-900/40 border-b border-white/5 flex-none">
                 <div className="flex items-center justify-between mb-3">
-                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">Path Mapping</h3>
+                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('mapping.title')}</h3>
                 </div>
 
                 {/* Tabs for Path Mapping Mode */}
                 <div className="flex space-x-1 bg-black/30 p-1 rounded-lg mb-4">
                   {[
-                    { id: PathMappingMode.SIMPLE, label: 'Simple Mapping', icon: Type },
-                    { id: PathMappingMode.REGEX, label: 'Regex Rules', icon: Code2 },
+                    { id: PathMappingMode.SIMPLE, label: t('mapping.simple'), icon: Type },
+                    { id: PathMappingMode.REGEX, label: t('mapping.regex'), icon: Code2 },
                   ].map((tab) => (
                     <button
                       key={tab.id}
@@ -502,17 +613,18 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                        // Simple Mode: Single Editor
                        <div className="animate-in fade-in duration-200">
                           <MappingGroupEditor 
-                             title="Path Mapping"
-                             subtitle="Map Local paths to Cloud paths using simple string matching"
+                             title={t('mapping.simpleTitle')}
+                             subtitle={t('mapping.simpleSubtitle')}
                              rules={simpleRules}
                              onChange={updateSimpleGroup}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.simple.borderColor}
                              bgColor={MAPPING_THEME.simple.bgColor}
-                             leftPlaceholder="Local Path"
-                             rightPlaceholder="Cloud Path"
+                             leftPlaceholder={t('mapping.localPath')}
+                             rightPlaceholder={t('mapping.cloudPath')}
                              leftInputClass={MAPPING_THEME.inputs.local}
                              rightInputClass={MAPPING_THEME.inputs.cloud}
+                             t={t}
                           />
                        </div>
                     ) : (
@@ -520,44 +632,48 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                        <div className="grid grid-cols-1 md:grid-cols-2 gap-4 animate-in fade-in duration-200">
                           {/* Row 1: Pre-Processing */}
                           <MappingGroupEditor 
-                             title="Local Playlist"
-                             subtitle="Pre-Processing (Before Sync)"
+                             title={t('server.local')}
+                             subtitle={t('mapping.regexPre')}
                              rules={regexRules.localPre}
                              onChange={(rules) => updateRegexGroup('localPre', rules)}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.local.borderColor}
                              bgColor={MAPPING_THEME.local.bgColor}
+                             t={t}
                           />
 
                           <MappingGroupEditor 
-                             title="Remote Playlist"
-                             subtitle="Pre-Processing (Before Sync)"
+                             title={t('server.cloud')}
+                             subtitle={t('mapping.regexPre')}
                              rules={regexRules.remotePre}
                              onChange={(rules) => updateRegexGroup('remotePre', rules)}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.remote.borderColor}
                              bgColor={MAPPING_THEME.remote.bgColor}
+                             t={t}
                           />
 
                           {/* Row 2: Post-Processing */}
                           <MappingGroupEditor 
-                             title="Local Playlist"
-                             subtitle="Post-Processing (After Sync / Result)"
+                             title={t('server.local')}
+                             subtitle={t('mapping.regexPost')}
                              rules={regexRules.localPost}
                              onChange={(rules) => updateRegexGroup('localPost', rules)}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.local.borderColor}
                              bgColor={MAPPING_THEME.local.bgColor}
+                             t={t}
                           />
 
                           <MappingGroupEditor 
-                             title="Remote Playlist"
-                             subtitle="Post-Processing (After Sync / Result)"
+                             title={t('server.cloud')}
+                             subtitle={t('mapping.regexPost')}
                              rules={regexRules.remotePost}
                              onChange={(rules) => updateRegexGroup('remotePost', rules)}
                              isLocked={isLocked}
                              borderColor={MAPPING_THEME.remote.borderColor}
                              bgColor={MAPPING_THEME.remote.bgColor}
+                             t={t}
                           />
                        </div>
                     )}
@@ -573,7 +689,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                             : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
                     >
                         <RotateCcw size={12} />
-                        <span>Revert</span>
+                        <span>{t('common.revert')}</span>
                     </button>
                     <button
                         onClick={handleSaveMappingClick}
@@ -584,7 +700,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                             : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
                     >
                         <Save size={12} />
-                        <span>Save Rules</span>
+                        <span>{t('mapping.saveRules')}</span>
                     </button>
                 </div>
             </div>
@@ -592,15 +708,15 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
             {/* Section 3: Scheduled Tasks */}
             <div className="p-4 bg-gray-900/40 border-b border-white/5 flex-none">
                  <div className="flex items-center justify-between mb-3">
-                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">Scheduled Tasks</h3>
+                    <h3 className="text-[10px] font-bold text-gray-500 uppercase tracking-widest">{t('schedule.title')}</h3>
                  </div>
 
                  {/* Tabs */}
                  <div className="flex space-x-1 bg-black/30 p-1 rounded-lg mb-4">
                     {[
-                      { id: ScheduleMode.CRON, label: 'Cron', icon: Repeat },
-                      { id: ScheduleMode.DAILY, label: 'Daily', icon: Clock },
-                      { id: ScheduleMode.WEEKLY, label: 'Weekly', icon: Calendar },
+                      { id: ScheduleMode.CRON, label: t('schedule.cron'), icon: Repeat },
+                      { id: ScheduleMode.DAILY, label: t('schedule.daily'), icon: Clock },
+                      { id: ScheduleMode.WEEKLY, label: t('schedule.weekly'), icon: Calendar },
                     ].map((tab) => (
                       <button
                         key={tab.id}
@@ -620,35 +736,49 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                  {/* Tab Content */}
                  <div className="mb-4 min-h-[50px]">
                     {activeScheduleTab === ScheduleMode.CRON && (
-                      <div className="space-y-2 animate-in fade-in duration-200">
-                         <div className="flex items-center space-x-2">
-                           <span className="text-gray-500 font-mono text-xs">Cron:</span>
-                           <input 
-                             type="text" 
-                             value={localSchedule.cronExpression}
-                             onChange={(e) => handleUpdateSchedule('cronExpression', e.target.value)}
-                             placeholder="0 0 * * *"
-                             className="flex-1 bg-gray-800 border border-gray-700 rounded-md px-2.5 py-1.5 text-xs text-gray-200 font-mono focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange placeholder-gray-600"
-                           />
+                      <div className="flex flex-col animate-in fade-in duration-200">
+                         {/* Top Row: Label + Switch */}
+                         <div className="flex items-center justify-between mb-3 px-1">
+                           <span className="text-xs text-gray-400 font-medium">{t('schedule.enableCron')}</span>
+                           <button 
+                               onClick={() => toggleScheduleEnable(ScheduleMode.CRON)}
+                               className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.CRON ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                           >
+                               <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.CRON ? 'translate-x-6' : 'translate-x-1'}`} />
+                           </button>
+                         </div>
+
+                         {/* Content */}
+                         <div className={`space-y-2 transition-opacity duration-200 ${localSchedule.mode !== ScheduleMode.CRON ? 'opacity-50 pointer-events-none' : ''}`}>
+                             <div className="flex items-center space-x-2">
+                               <span className="text-gray-500 font-mono text-xs">Cron:</span>
+                               <input 
+                                 type="text" 
+                                 value={localSchedule.cronExpression}
+                                 onChange={(e) => handleUpdateSchedule('cronExpression', e.target.value)}
+                                 placeholder="0 0 * * *"
+                                 disabled={localSchedule.mode !== ScheduleMode.CRON}
+                                 className="flex-1 bg-gray-800 border border-gray-700 rounded-md px-2.5 py-1.5 text-xs text-gray-200 font-mono focus:border-plex-orange focus:outline-none focus:ring-1 focus:ring-plex-orange placeholder-gray-600"
+                               />
+                             </div>
+                             <p className="text-[10px] text-gray-500">
+                               Unix-cron format.
+                             </p>
                          </div>
-                         <p className="text-[10px] text-gray-500">
-                           Unix-cron format. Leave empty to disable schedule.
-                         </p>
                       </div>
                     )}
 
                     {activeScheduleTab === ScheduleMode.DAILY && (
                        <div className="flex flex-col animate-in fade-in duration-200">
-                          {/* Top Row: Checkbox + Label */}
-                          <div className="flex items-center justify-start space-x-2 mb-2">
+                          {/* Top Row: Label + Switch */}
+                          <div className="flex items-center justify-between mb-3 px-1">
+                            <span className="text-xs text-gray-400 font-medium">{t('schedule.enableDaily')}</span>
                             <button 
                                 onClick={() => toggleScheduleEnable(ScheduleMode.DAILY)}
-                                className={`transition-colors flex-none ${localSchedule.mode === ScheduleMode.DAILY ? 'text-plex-orange' : 'text-gray-500 hover:text-gray-400'}`}
-                                title={localSchedule.mode === ScheduleMode.DAILY ? "Schedule Enabled" : "Schedule Disabled"}
+                                className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.DAILY ? 'bg-plex-orange' : 'bg-gray-700'}`}
                             >
-                                {localSchedule.mode === ScheduleMode.DAILY ? <CheckSquare size={16} /> : <Square size={16} />}
+                                <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.DAILY ? 'translate-x-6' : 'translate-x-1'}`} />
                             </button>
-                            <label className="text-xs text-gray-400 font-medium">Run daily at:</label>
                           </div>
                           
                           {/* Bottom Row: Centered Native Time Input */}
@@ -666,16 +796,15 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
 
                     {activeScheduleTab === ScheduleMode.WEEKLY && (
                        <div className="flex flex-col animate-in fade-in duration-200">
-                          {/* Top Row: Checkbox + Label */}
-                          <div className="flex items-center justify-start space-x-2 mb-2">
-                              <button 
+                          {/* Top Row: Label + Switch */}
+                          <div className="flex items-center justify-between mb-3 px-1">
+                            <span className="text-xs text-gray-400 font-medium">{t('schedule.enableWeekly')}</span>
+                            <button 
                                 onClick={() => toggleScheduleEnable(ScheduleMode.WEEKLY)}
-                                className={`transition-colors flex-none ${localSchedule.mode === ScheduleMode.WEEKLY ? 'text-plex-orange' : 'text-gray-500 hover:text-gray-400'}`}
-                                title={localSchedule.mode === ScheduleMode.WEEKLY ? "Schedule Enabled" : "Schedule Disabled"}
-                              >
-                                  {localSchedule.mode === ScheduleMode.WEEKLY ? <CheckSquare size={16} /> : <Square size={16} />}
-                              </button>
-                              <label className="text-xs text-gray-400 font-medium">Run on days:</label>
+                                className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.mode === ScheduleMode.WEEKLY ? 'bg-plex-orange' : 'bg-gray-700'}`}
+                            >
+                                <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.mode === ScheduleMode.WEEKLY ? 'translate-x-6' : 'translate-x-1'}`} />
+                            </button>
                           </div>
 
                           {/* Middle Row: Full Width Capsules */}
@@ -714,20 +843,22 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                     )}
                  </div>
 
-                 {/* Auto Watch Checkbox */}
-                 <div className="flex items-center mb-4 px-1">
+                 {/* Auto Watch Switch */}
+                 <div className="flex items-center justify-between mb-4 mt-2 px-1">
+                    <div className="flex items-center space-x-2">
+                        <div className="p-1.5 rounded-lg bg-orange-500/10 border border-orange-500/20 text-orange-400">
+                             <Eye size={16} />
+                        </div>
+                        <div className="flex flex-col">
+                             <span className="text-sm font-medium text-gray-200">{t('schedule.watchLocal')}</span>
+                             <span className="text-[10px] text-gray-500">{t('schedule.watchDesc')}</span>
+                        </div>
+                    </div>
                     <button 
-                      onClick={() => handleUpdateSchedule('autoWatch', !localSchedule.autoWatch)}
-                      className="flex items-center space-x-2 group"
+                        onClick={() => handleUpdateSchedule('autoWatch', !localSchedule.autoWatch)}
+                        className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-plex-orange focus:ring-offset-2 focus:ring-offset-gray-900 ${localSchedule.autoWatch ? 'bg-plex-orange' : 'bg-gray-700'}`}
                     >
-                       {localSchedule.autoWatch ? (
-                         <CheckSquare size={16} className="text-plex-orange" />
-                       ) : (
-                         <Square size={16} className="text-gray-600 group-hover:text-gray-400" />
-                       )}
-                       <span className={`text-xs ${localSchedule.autoWatch ? 'text-gray-200' : 'text-gray-500 group-hover:text-gray-400'}`}>
-                         Watch for local playlist changes
-                       </span>
+                        <span className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${localSchedule.autoWatch ? 'translate-x-6' : 'translate-x-1'}`} />
                     </button>
                  </div>
 
@@ -742,7 +873,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                                 : 'bg-transparent border-transparent text-gray-700 cursor-not-allowed'}`}
                         >
                             <RotateCcw size={12} />
-                            <span>Revert</span>
+                            <span>{t('common.revert')}</span>
                         </button>
                         <button
                             onClick={handleSaveScheduleClick}
@@ -753,7 +884,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                                 : 'bg-gray-800/30 border-gray-800/50 text-gray-600 cursor-not-allowed'}`}
                         >
                             <Save size={12} />
-                            <span>Save</span>
+                            <span>{t('common.save')}</span>
                         </button>
                     </div>
             </div>
@@ -767,7 +898,7 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                 className={`w-full py-3 rounded-lg text-sm font-bold flex items-center justify-center gap-2 transition-all shadow-lg
                 ${isLocked 
                     ? 'bg-gray-700/30 text-gray-500 cursor-not-allowed border border-gray-700/50' 
-                    : isMappingDirty
+                    : isMappingDirty || isBackupDirty
                         ? 'bg-gray-800 text-gray-500 cursor-not-allowed border border-gray-700'
                         : 'bg-green-600 hover:bg-green-500 text-white border border-green-500 shadow-green-900/20 active:scale-[0.98]'
                 }`}
@@ -775,18 +906,18 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
                 {isSyncing ? (
                     <>
                         <Loader2 size={16} className="animate-spin" />
-                        <span>Sync in Progress...</span>
+                        <span>{t('strategies.syncing')}</span>
                     </>
                 ) : (
                     <>
                         <Zap size={16} fill="currentColor" />
-                        <span>Sync Now</span>
+                        <span>{t('strategies.syncNow')}</span>
                     </>
                 )}
             </button>
-            {(isMappingDirty) && (
+            {(isMappingDirty || isBackupDirty) && (
                 <p className="text-[10px] text-plex-orange text-center mt-2">
-                    Please save path mapping changes before syncing.
+                    {t('strategies.saveWarning')}
                 </p>
             )}
         </div>
@@ -795,4 +926,4 @@ const StrategySelector: React.FC<StrategySelectorProps> = ({
   );
 };
 
-export default StrategySelector;
+export default StrategySelector;

sample-front-end/index.html

@@ -1,9 +1,10 @@
+
 <!DOCTYPE html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>PlexSync Manager</title>
+    <title>PMS Playlist Sync</title>
     <script src="https://cdn.tailwindcss.com"></script>
     <script>
       tailwind.config = {
@@ -73,4 +74,4 @@
   <body class="bg-gray-900 text-gray-100 antialiased min-h-screen">
     <div id="root"></div>
   </body>
-</html>
+</html>

sample-front-end/index.tsx

@@ -1,6 +1,8 @@
+
 import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App';
+import { LanguageProvider } from './LanguageContext';
 
 const rootElement = document.getElementById('root');
 if (!rootElement) {
@@ -10,6 +12,8 @@ if (!rootElement) {
 const root = ReactDOM.createRoot(rootElement);
 root.render(
   <React.StrictMode>
-    <App />
+    <LanguageProvider>
+      <App />
+    </LanguageProvider>
   </React.StrictMode>
-);
+);

sample-front-end/locales/en.ts

@@ -0,0 +1,147 @@
+
+export const en = {
+  app: {
+    // title and manager are no longer used for branding
+    title: 'PlexSync', 
+    manager: 'Manager',
+    footer: '© {year} PMS Playlist Sync. Connected to Docker backend.',
+  },
+  common: {
+    save: 'Save',
+    cancel: 'Cancel',
+    revert: 'Revert',
+    delete: 'Delete',
+    done: 'Done',
+    loading: 'Loading...',
+    refresh: 'Refresh',
+    close: 'Close',
+    none: 'None',
+    disabled: 'Disabled',
+    add: 'Add',
+  },
+  server: {
+    local: 'Local Server',
+    cloud: 'Cloud Server',
+    playlists: '{count} Playlists',
+    notConnected: 'Not Connected',
+    connectionFailed: 'Connection failed',
+    connecting: 'Connecting...',
+    waiting: 'Waiting...',
+    syncing: 'Syncing...',
+    noPlaylists: 'No playlists found.',
+    cancelRefresh: 'Cancel Refresh',
+    refreshPlaylists: 'Refresh Playlists',
+  },
+  playlist: {
+    trackCount: 'Track Count',
+    lastUpdated: 'Last Updated',
+  },
+  dashboard: {
+    mapping: 'Mapping',
+    backup: 'Backup',
+    autoSync: 'Auto-Sync',
+    watch: 'Watch',
+    watchModeActive: 'Watch Mode: Active',
+    watchModeDisabled: 'Watch Mode: Disabled',
+    notSet: 'Not Set',
+    retain: 'Retain: {count}',
+    keep: 'Keep {count}',
+    connected: 'Connected to Plex',
+    disconnected: 'Disconnected',
+    synchronizing: 'SYNCHRONIZING',
+    syncComplete: 'SYNC COMPLETE',
+  },
+  strategies: {
+    title: 'Sync Strategy',
+    localOverwrite: {
+      label: 'Local Overwrite',
+      desc: 'Local playlist completely overwrites Cloud. (No Diff)',
+    },
+    cloudOverwrite: {
+      label: 'Cloud Overwrite',
+      desc: 'Cloud playlist completely overwrites Local. (No Diff)',
+    },
+    mergeLocal: {
+      label: 'Two-way Merge (Local Priority)',
+      desc: 'Merge both. Conflicts resolve to Local version.',
+    },
+    mergeCloud: {
+      label: 'Two-way Merge (Cloud Priority)',
+      desc: 'Merge both. Conflicts resolve to Cloud version.',
+    },
+    syncNow: 'Sync Now',
+    syncing: 'Sync in Progress...',
+    saveWarning: 'Please save pending changes (Backups/Path Mapping) before syncing.',
+  },
+  mapping: {
+    title: 'Path Mapping',
+    simple: 'Simple Mapping',
+    regex: 'Regex Rules',
+    simpleTitle: 'Path Mapping',
+    simpleSubtitle: 'Map Local paths to Cloud paths using simple string matching',
+    regexPre: 'Pre-Processing (Before Sync)',
+    regexPost: 'Post-Processing (After Sync / Result)',
+    localPath: 'Local Path',
+    cloudPath: 'Cloud Path',
+    pattern: 'Pattern',
+    replace: 'Replace',
+    saveRules: 'Save Rules',
+    noRules: 'No rules defined.',
+  },
+  backup: {
+    title: 'Backup Retention',
+    enable: 'Enable Backups',
+    enableDesc: 'Create a copy before changes',
+    maxVersions: 'Max versions to keep:',
+    autoDelete: 'Oldest deleted automatically',
+  },
+  schedule: {
+    title: 'Scheduled Tasks',
+    cron: 'Cron',
+    daily: 'Daily',
+    weekly: 'Weekly',
+    enableCron: 'Enable Cron Schedule',
+    enableDaily: 'Enable Daily Run',
+    enableWeekly: 'Enable Weekly Run',
+    watchLocal: 'Watch Local Changes',
+    watchDesc: 'Auto-sync when local playlist updates',
+    schedule: 'Schedule',
+    notConfigured: 'Not configured',
+    today: 'Today',
+    tomorrow: 'Tomorrow',
+  },
+  connection: {
+    titleConnected: 'Server Connected',
+    titleConnect: 'Connect Plex Server',
+    serverDetails: 'Server Details',
+    authentication: 'Authentication',
+    protocol: 'Protocol',
+    address: 'IP Address or Domain',
+    port: 'Port',
+    token: 'X-Plex-Token (Optional)',
+    username: 'Username / Email',
+    password: 'Password',
+    advanced: 'Advanced Options',
+    timeout: 'Connection Timeout (Seconds)',
+    connectBtn: 'Connect Server',
+    connecting: 'Connecting...',
+    connectedSuccess: 'Connected Successfully',
+    selectLibrary: 'Select Library to Sync',
+  },
+  toasts: {
+    localRefreshCancelled: 'Local refresh cancelled.',
+    cloudRefreshCancelled: 'Cloud refresh cancelled.',
+    strategySaved: 'Selected strategy "{strategy}" has been saved.',
+    mappingSaved: 'Path mapping rules have been saved.',
+    backupSaved: 'Backup settings have been saved.',
+    backupFailed: 'Failed to save backup settings.',
+    scheduleDisabled: 'Scheduled tasks disabled.',
+    scheduleEmpty: 'Scheduled tasks disabled (Empty Cron).',
+    scheduleStarted: 'Scheduled task started successfully.',
+    scheduleFailed: 'Failed to update schedule.',
+    syncFailed: 'Sync failed. Please check connection.',
+    librarySwitched: 'Library switched to {library}',
+    connectedTo: 'Successfully connected to {name}',
+    connectionCancelled: 'Connection cancelled by user.',
+  }
+};

sample-front-end/locales/es.ts

@@ -0,0 +1,147 @@
+
+export const es = {
+  app: {
+    // title and manager are no longer used for branding
+    title: 'PlexSync',
+    manager: 'Gestor',
+    footer: '© {year} PMS Playlist Sync. Conectado al backend Docker.',
+  },
+  common: {
+    save: 'Guardar',
+    cancel: 'Cancelar',
+    revert: 'Revertir',
+    delete: 'Eliminar',
+    done: 'Hecho',
+    loading: 'Cargando...',
+    refresh: 'Actualizar',
+    close: 'Cerrar',
+    none: 'Ninguno',
+    disabled: 'Deshabilitado',
+    add: 'Añadir',
+  },
+  server: {
+    local: 'Servidor Local',
+    cloud: 'Servidor Nube',
+    playlists: '{count} Listas',
+    notConnected: 'No Conectado',
+    connectionFailed: 'Conexión fallida',
+    connecting: 'Conectando...',
+    waiting: 'Esperando...',
+    syncing: 'Sincronizando...',
+    noPlaylists: 'No se encontraron listas.',
+    cancelRefresh: 'Cancelar',
+    refreshPlaylists: 'Actualizar Listas',
+  },
+  playlist: {
+    trackCount: 'Pistas',
+    lastUpdated: 'Actualizado',
+  },
+  dashboard: {
+    mapping: 'Mapeo',
+    backup: 'Respaldo',
+    autoSync: 'Auto-Sync',
+    watch: 'Vigilar',
+    watchModeActive: 'Modo Vigía: Activo',
+    watchModeDisabled: 'Modo Vigía: Desactivado',
+    notSet: 'No Def.',
+    retain: 'Retener: {count}',
+    keep: 'Guardar {count}',
+    connected: 'Conectado a Plex',
+    disconnected: 'Desconectado',
+    synchronizing: 'SINCRONIZANDO',
+    syncComplete: 'SINCRONIZACIÓN COMPLETA',
+  },
+  strategies: {
+    title: 'Estrategia de Sync',
+    localOverwrite: {
+      label: 'Sobreescribir Local',
+      desc: 'La lista local sobreescribe la nube. (Sin Diff)',
+    },
+    cloudOverwrite: {
+      label: 'Sobreescribir Nube',
+      desc: 'La lista de la nube sobreescribe la local. (Sin Diff)',
+    },
+    mergeLocal: {
+      label: 'Fusión (Prioridad Local)',
+      desc: 'Fusionar ambas. Conflictos resueltos a versión Local.',
+    },
+    mergeCloud: {
+      label: 'Fusión (Prioridad Nube)',
+      desc: 'Fusionar ambas. Conflictos resueltos a versión Nube.',
+    },
+    syncNow: 'Sincronizar Ahora',
+    syncing: 'Sincronizando...',
+    saveWarning: 'Guarde los cambios pendientes (Respaldos/Mapeo) antes de sincronizar.',
+  },
+  mapping: {
+    title: 'Mapeo de Rutas',
+    simple: 'Mapeo Simple',
+    regex: 'Reglas Regex',
+    simpleTitle: 'Mapeo de Rutas',
+    simpleSubtitle: 'Mapear rutas locales a la nube usando coincidencia simple',
+    regexPre: 'Pre-Procesamiento (Antes de Sync)',
+    regexPost: 'Post-Procesamiento (Después de Sync)',
+    localPath: 'Ruta Local',
+    cloudPath: 'Ruta Nube',
+    pattern: 'Patrón',
+    replace: 'Reemplazo',
+    saveRules: 'Guardar Reglas',
+    noRules: 'No hay reglas definidas.',
+  },
+  backup: {
+    title: 'Retención de Respaldo',
+    enable: 'Habilitar Respaldos',
+    enableDesc: 'Crear copia antes de cambios',
+    maxVersions: 'Máx versiones a guardar:',
+    autoDelete: 'El más antiguo se borra automáticamente',
+  },
+  schedule: {
+    title: 'Tareas Programadas',
+    cron: 'Cron',
+    daily: 'Diario',
+    weekly: 'Semanal',
+    enableCron: 'Habilitar Cron',
+    enableDaily: 'Habilitar Ejecución Diaria',
+    enableWeekly: 'Habilitar Ejecución Semanal',
+    watchLocal: 'Vigilar Cambios Locales',
+    watchDesc: 'Auto-sync cuando la lista local se actualiza',
+    schedule: 'Horario',
+    notConfigured: 'No configurado',
+    today: 'Hoy',
+    tomorrow: 'Mañana',
+  },
+  connection: {
+    titleConnected: 'Servidor Conectado',
+    titleConnect: 'Conectar Servidor Plex',
+    serverDetails: 'Detalles del Servidor',
+    authentication: 'Autenticación',
+    protocol: 'Protocolo',
+    address: 'Dirección IP o Dominio',
+    port: 'Puerto',
+    token: 'X-Plex-Token (Opcional)',
+    username: 'Usuario / Email',
+    password: 'Password',
+    advanced: 'Opciones Avanzadas',
+    timeout: 'Tiempo de espera (Segundos)',
+    connectBtn: 'Conectar Servidor',
+    connecting: 'Conectando...',
+    connectedSuccess: 'Conectado Exitosamente',
+    selectLibrary: 'Seleccionar Librería',
+  },
+  toasts: {
+    localRefreshCancelled: 'Actualización local cancelada.',
+    cloudRefreshCancelled: 'Actualización nube cancelada.',
+    strategySaved: 'Estrategia seleccionada "{strategy}" guardada.',
+    mappingSaved: 'Reglas de mapeo guardadas.',
+    backupSaved: 'Configuración de respaldo guardada.',
+    backupFailed: 'Error al guardar configuración de respaldo.',
+    scheduleDisabled: 'Tareas programadas deshabilitadas.',
+    scheduleEmpty: 'Tareas programadas deshabilitadas (Cron Vacío).',
+    scheduleStarted: 'Tarea programada iniciada exitosamente.',
+    scheduleFailed: 'Error al actualizar horario.',
+    syncFailed: 'Fallo en sync. Revise conexión.',
+    librarySwitched: 'Librería cambiada a {library}',
+    connectedTo: 'Conectado exitosamente a {name}',
+    connectionCancelled: 'Conexión cancelada por usuario.',
+  }
+};

sample-front-end/metadata.json

@@ -1,5 +1,5 @@
 {
-  "name": "PlexSync Manager",
+  "name": "PMS Playlist Sync",
   "description": "A modern dashboard to synchronize and manage playlists between Local and Cloud Plex servers.",
   "requestFramePermissions": []
 }

sample-front-end/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "plexsync-manager",
+  "name": "pms-playlist-sync",
   "private": true,
   "version": "0.0.0",
   "type": "module",

sample-front-end/services/api.ts

@@ -2,7 +2,8 @@
 
 
 
-import { Playlist, ServerType, ApiResponse, PlexServerConnection, PlexConnectionSettings, PlexLibrary, SyncStrategy, PathMappingConfig, ScheduleSettings, ScheduleMode } from '../types';
+
+import { Playlist, ServerType, ApiResponse, PlexServerConnection, PlexConnectionSettings, PlexLibrary, SyncStrategy, PathMappingConfig, ScheduleSettings, ScheduleMode, BackupSettings } from '../types';
 import { MOCK_LOCAL_PLAYLISTS, MOCK_CLOUD_PLAYLISTS } from './mockData';
 
 const SIMULATE_DELAY_MS = 800;
@@ -220,5 +221,13 @@ export const apiService = {
         resolve({ data: null, status: 'success', message: 'Schedule updated successfully' });
       }, 500);
     });
+  },
+
+  saveBackupSettings: async (settings: BackupSettings): Promise<ApiResponse<null>> => {
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        resolve({ data: null, status: 'success', message: 'Backup settings saved' });
+      }, 500);
+    });
   }
 };

sample-front-end/translations.ts

@@ -0,0 +1,11 @@
+
+import { en } from './locales/en';
+import { es } from './locales/es';
+
+export const translations = {
+  en,
+  es
+};
+
+export type Language = keyof typeof translations;
+export type TranslationStructure = typeof en;

sample-front-end/types.ts

@@ -59,6 +59,11 @@ export interface PathMappingConfig {
   regex: PathMappingRules;
 }
 
+export interface BackupSettings {
+  enabled: boolean;
+  retentionCount: number;
+}
+
 export enum ScheduleMode {
   DISABLED = 'DISABLED',
   CRON = 'CRON',