Display MoreYou changed the level-name setting in the server.properties from which causes your server to try loading another world. That's why your server world was lost after a restart.
Such things can easily be fixed by setting the property back to its old value, but your own attempts to fix the issue made the whole situation made situation worse. The world does not exist anymore.
Our system created a backup at 2021-04-27 22:29:00.093 +02:00. 24 hours after the last backup was made and while the server stopped -> That's how it should work.
Unfortunately, there's nothing wrong on our side. It is your own fault.
im sorry thank you for your reply