Dang Chipahoy, did you get your problem resolved? I am not enough of a power user to comprehend your problem. I know that calibre doesn't backup the books themselves, so by backup would that pretty much amount to the Metadata.db file? The database file storing your metadata is corrupt?
There is debug mode tucked in the "Preferences" menu. It will restart the application and create a comprehensive log file documenting each event. Retrace the procedure you have described in your troubleshooting and when you quit, a txt file will popup. You can copy that here or on pastebin etc. For extra points make a video.
I have lost my metadata before and if you are so upset it is likely because your library is big and you invested a tremendous amount of time in compiling that metadata. I get it the pain you feel and can't promise to help you but at the very least we will update the ticket here with the log file (and video if you can manage). Still no luck we will post on the calibre Reddit page and I have an underground forum we can try too.
I am a mac user. My laptop has been thrown a few times and I appreciate the build quality but I know it can be difficult to find help :-)
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