Update sync_data.sh

sync_data.sh

@@ -126,8 +126,8 @@ options = {
 client = Client(options)
 backups = [file for file in client.list() if file.endswith('.tar.gz') and file.startswith('imageflow_backup_')]
 backups.sort()
-if len(backups) > 5:
-    to_delete = len(backups) - 5
+if len(backups) > 1:
+    to_delete = len(backups) - 1
     for file in backups[:to_delete]:
         client.clean(file)
         print(f'Successfully deleted {file}.')