[redler]

Trolling, I assume? Just in case not: your own oh-shit moments (forgot that WHERE clause?), coding errors and oversights, bad luck, adversary SQL injection because the contractor who wrote some obscure admin page two years ago didn't know what he was doing, customer screw-ups (your web app customer fat-fingers their own critical data out of existence and begs you to roll them back to yesterday), etc.

If you have a real business you need a multi-generational backup scheme of some kind.