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I remember reading about a guy whose job it was to make tape backups once a week and then place them in a fireproof box. He did his job dutifully for a few months, but when a drive crashed they found out that none of the tapes had anything on them. To solve the mystery, the boss had the guy go through his backup routine to see if he was doing it wrong, but it all looked fine. When they were done, the guy figured he'd have his usual post-backup cup of tea, so he filled the electric kettle with water, plugged it into the wall socket and placed it on the nearest flat surface, the top of the fireproof box. The boss then saw that the AC coil in the kettle was bulk erasing all the tapes underneath.
The lesson is: test your backups!
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