If you were just having fun, I don't think I'm going to spend hours downloading backups, exporting areas out of them and stitching them into each other to save your stuff just because you thought it'd be fun to smash them and I'm happily wasting my time on nothing.
But I guess there's no other option. Well, turning off the server for tomorrow, then we'll see what's going to happen. It's definitely not ok that anyone griefs, but either it's griefing or it's not. If you do it for fun and you agree, then it's not griefing and then you're responsible for the mess yourself. Then I don't want to waste my time on it.