The very nice thing about the MediaWiki model is that it maintains its own revision history, so if someone does go nuts and start deleting pages, then it's pretty simple to revert. In our case it is, in this incarnation, a strictly in-house thing, so I imagine if someone did start deleting pages willy nilly our GM, who is one of the biggest contributors, would be none too pleased with them.
Yes, the machine backs up its database regularly in case of catastrophic