Last night a friend and I were messing around on the server, just building and doing general things when the server totally locked up, then booted us both. I could not connect to it for about 20 mins after. Said it was an old server, then just couldn't connect. I went into my control panel and had to press "Start" for some reason it has stopped. When we logged back on everything was gone, EVERYTHING. I run a standard/vanilla server with no pluggins. Is there anyway to get it back? (no, I didn't make a backup, like an idiot it never crossed my mind) What did I do wrong that would cause this, so I can make sure I don't do it again?