For some reason this is one of the worst of these I've ever read.

I've personally f'd up pretty bad restoring a database to the wrong the site and blowing away 3 months of content. We didn't ever do any offsite backups and I just lucky to have an in with our hosting company and they managed to get everything back but those 3 months.

Once bitten, you're always way more cautious but it's easy to get lazy again from time to time.