My worst backup disaster was restoring my calibre library after loss of a laptop and finding that the backup drive I had been using has been designed to only backup major file types. So the library initially looked fine, because the cover graphics has been saved along with the few pdfs. But the majority were empty. Luckily the previous backup drive was still on the shelf with 75% of the library so only the newer items had to be tracked down. I still curse whoever designed that thing when I think about it.
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