Quote:
Originally Posted by Aussiecubs
Further, I use GoodSync to do a regular one way backup of my Calibre folder to another computer and to Dropbox.
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Has there ever been a time before Goodsync that you used the calibre library in Dropbox directly?
Many years ago this happened to me because I did not pause sync during book conversions or while adding books. Then to compound things when Library maintenance was first introduced I didn't look close enough when it said there were extra titles and simply deleted the extra titles. The issue was because the sync interfered, the metadata.db file (which is the heart of the library) wasn't updated as expected. So deleting extra titles was removing books that should have been re-added to the library.
These missing books were my fault, but I didn't realize it at the time. This hasn't happened to me in years, but every now and then I do have to clean up mistakes and put the the books back. My work flow is better now, not perfect, but I never lose books anymore.
Go into Dropbox and show deleted files, maybe some of the books still exist in Dropbox.