@BetterRed
Some folders are completely empty, some folders have a cover.jpg file and some folders have both a cover.jpg and a metadata.opf file. The only thing in common with them all is the fact that there is no .epbu or .mobi file.
As best as I can work out, the GoodSync backup directories seem to exactly mirror the Calibre directories on the computer.
I am absolutely certain I have not suppressed any "are you sure you want to do this" messages and I have not installed any keyboard shortcuts.
@DoctorOhh
This could be the reason. I did at one time have it set up with the Calibre directory inside a Dropbox folder. I only discovered the 117 missing format files recently as part of the process of moving the files to a new (non-Dropbox) folder and adopting a different backup strategy using GoodSync.
I checked the Dropbox deleted files folder but none of the files were there. I think Dropbox only stores my deleted files for 30 days so likely all this happened before then.
As it is only 117 and a fair amount of them are among my lower rated books they are no great loss. The important few that I am really keen on I think I can get my hands on them again.
@ All contributors
Thank you for your advice. A salutary lesson for me about the fact that you cannot be too careful about checking what you have and making sure that your have a fail proof backup plan.
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