Coding horror has, after their mishap last week, declared International Backup Awareness Day. Speaking again as someone who has had this happen more than once, I have learned about backups and disaster recovery. In fact, I'm happy to say that the last time I had issues, when a bad controller brought down 3 drives simultaneously in my 5 disk RAID5 array, having an "offsite" (read: USB HD plugged into the back of the server) backup saved my ass. Previous times I haven't been so lucky :)
You can listen to it on http://hearablog.com/site/2/Coding-Horror#231
At home I have 2 computers with copies of most of each other's data, plus an external drive with a copy.
But at work... IBM SAN + additional disk storage for short term backups + tape backup + offsite storage of tapes (Iron Mountain) + secondary site with a fair amount of backup information.
I think we are mostly covered.