About 15 mins ago, I managed to do something utterly stupid (it involved VMware snapshots) and reverted my server to the state it was in as of 31 March. Notice how it only took me 15 mins to get this post out?
Before you start thinking it, no, this post doesn't just exist to boost my ego (I already know I rock). As I keep telling the masses; everyone needs backups. Drives are cheap these days. Storage on Amazon S3 is dirt cheap. Whatever solution floats your boat, make sure you're taking regular dumps of your data.