This is exactly why I haven't "gone public" with the wiki yet. It's simply not ready (thus the "testwiki" directory). Automatic backups were implemented a little while ago, so nothing should be completely lost. I just have to go through and restore everything. Unfortunately IP logging was not functioning properly, so I can't identify who vandalized the wiki. I've fixed it now, so if anybody does this again, we'll be able to identify him. Unfortunately "securing it" isn't a trivial task or it would have been done a while back. I'm going to try to tie it into the global login, though. But that may not be for a little while.