I noticed that we weren't validating backups at a company I used to work at so I did a /really/ simple hack where I checked that the backups were within a certa

I noticed that we weren't validating backups at a company I used to work at so I did a /really/ simple hack where I checked that the backups were within a certain number of bytes in size of the previous dump. Literally a couple of weeks later after putting this live (I think it was a Nagios check) it alerted that the backups had gone down from many 10s of GB to a few k in size. I can't remember what had gone wrong now, it was years ago, but we /did/ catch the issue. Obviously this isn't a comprehensive check, I later wrote a tool that pulled backups down, restored them, and did some sanity checks on the data, but the quick hack worked as an interim.