Uh oh. You forgot to put a password on your server and a chronic griefer got it and destroyed your entire factory. No mercy. Now you need to restore a backup. Here's how you can do that. Be sure to check out our guide on configuring backups as well.
1. Open the File Manager
2. Navigate to /.config/Epic/FactoryGame/Saved/SaveGames/
3. Delete the latest save if you no longer need it, which is autosave_0
4. Rename one of the previous autosaves to autosave_0
5. Restart the server and this save will now load.