I have this error for 1 week now… Checked the logs. I get this 2026-03-21 21:00:00.111 ERROR (MainThread) [supervisor.homeassistant.module] Preparing backup of Home Assistant Core failed. Failed to inform HA Core: Unsuccessful websocket message - {‘id’: 318, ‘type’: ‘result’, ‘success’: False, ‘error’: {‘code’: ‘pre_backup_actions_failed’, ‘message’: ‘Error during pre-backup: Connection has been closed’}}.
2026-03-21 21:00:00.113 ERROR (MainThread) [supervisor.backups.manager] Backup 328575c6 error: Preparing backup of Home Assistant Core failed. Failed to inform HA Core: Unsuccessful websocket message - {‘id’: 318, ‘type’: ‘result’, ‘success’: False, ‘error’: {‘code’: ‘pre_backup_actions_failed’, ‘message’: ‘Error during pre-backup: Connection has been closed’}}. Any ideas???
Start by checking how much storage space you have available in HA
Nah i have more than 100gb free…
Does it clear after you reboot the host? Sometimes tmp files build up and cause issue.
Is it trying to back up a mounted drive or something that’s too big for the main HA drive?
Reboot doesnt help. There is no other drive. Just the main HA SSD 256gb.
Just changed the Schedule time for the backup and now its working! Dont know how or why…