fix(backup): add user-state backup UI and storage

py/services/service_registry.py

@@ -159,10 +159,9 @@ class ServiceRegistry:
                 return cls._services[service_name]
 
             from .model_update_service import ModelUpdateService
-            from .persistent_model_cache import get_persistent_cache
+            from .settings_manager import get_settings_manager
 
-            cache = get_persistent_cache()
-            service = ModelUpdateService(cache.get_database_path())
+            service = ModelUpdateService(settings_manager=get_settings_manager())
             cls._services[service_name] = service
             logger.debug(f"Created and registered {service_name}")
             return service
@@ -189,6 +188,26 @@ class ServiceRegistry:
             logger.debug(f"Created and registered {service_name}")
             return service
 
+    @classmethod
+    async def get_backup_service(cls):
+        """Get or create the backup service."""
+
+        service_name = "backup_service"
+
+        if service_name in cls._services:
+            return cls._services[service_name]
+
+        async with cls._get_lock(service_name):
+            if service_name in cls._services:
+                return cls._services[service_name]
+
+            from .backup_service import BackupService
+
+            service = await BackupService.get_instance()
+            cls._services[service_name] = service
+            logger.debug(f"Created and registered {service_name}")
+            return service
+
     @classmethod
     async def get_civarchive_client(cls):
         """Get or create CivArchive client instance"""