If you've ever looked into how to properly back up your important files, chances are someone pointed you to the 3-2-1 backup rule. Keep three copies of your data, store them on two different media types, and keep one copy offsite. It's simple, easy to remember, and just about every backup guide on the internet recommends it. I followed this rule for years, and I was confident my files were safe. However, when I needed to restore a backup, I discovered that the files I'd been dutifully copying for months were corrupted. The backup existed, sure, but it was useless.
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