Implement backup functionality with UI and backend support

Co-authored-by: Koha9 <36852125+Koha9@users.noreply.github.com>

app/utils/sync_manager.py

@@ -5,6 +5,7 @@ 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
 
 class SyncManager:
     def __init__(self):
@@ -110,6 +111,10 @@ 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)