By acting like an idiot on my machine at 3 AM I destroyed something so it doesn’t work anymore.
I can log in to the admin panel and the webmail (via IP) but if I try to change something in the admin panel it always goes 500.
Maybe I’m stupid but I don’t understand how to restore the backup of that, can someone write me the right command, please?
Ok there is your first problem. Restore is all or nothing.
From where comes this???
Anyways, we should examine what the underlying cause is … simply restoring your backup is not likely to fix that. Since you don’t quite seem to remember what exactly you did at 3AM it MAY be a better choice to simply migrate to a different VPS.