Quote:
Originally Posted by aceflor
I have not tried renaming the metadata.db, that is actually a good idea...
I did not access calibre from 2 places at the same time. My library is on OneDrive, but I am always accessing it from the same one and only laptop.
My last backup is from August, and since then I have cleaned and organized my library. I would love not to loose the work.....
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Well, a restore should fix it anyway.
Corruption of the database almost never IME correlates with missing book formats+OPFs.
Dropbox can disappear books via syncing conflicts, leading to duplication of old versions, but normally the database either disappears or remains intact but possibly old. Not corrupted.
tl;dr your files (database aside) are probably all right, so a restore will solve everything.
Prudence would dictate you backup your whole library Just In Case, though.