First of all--thanks to everyone for taking the time and for the helpful suggestions!
Quote:
Originally Posted by BetterRed
Whilst I have File History enabled on my calibre libraries, I regard it as a last resort backup source for an entire library.
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Definitely a last resort situation. I'm normally pretty good about having a fairly current backup image of my HD too, but I got sloppy this time.
Anyway, to be clear, I have the File History on a NAS, not Google Drive. I'm still in the process of trying to rebuild this computer and wasn't really ready to do the full restore yet, so I downloaded the Calibre folder from the NAS instead of restoring it through File History. I guess File History is adding the datestamp for new versions of the file? It never occurred to me. The info that File History cleans things up when you restore accounts for my issue, so thanks, BetterRed. I've been lucky enough that File History is a "Break Glass in Case of Emergency" deal that I've only ever had to use to recover the odd file or folder.
Yesterday I tried renaming the most recent .db and .json files, then pointed Calibre at the folder. It worked, mostly, but after reading these posts this morning and doing the Library Check I see that there are some files within the library that also got date stamps added, which is causing a few problems. I'm going to try to restore the folder instead, and I'll report back the results.
Thanks again for all the helpful comments--you have saved me a lot of hair-pulling trying to figure this out.