Quote:
Originally Posted by BetterRed
 - wise non-move!
Agreed 110%.
- Is the library synced to cloud storage - e.g. dropbox, google drive etc?
- What OS are you using (Windows, OSX or Linux) and what file system is the library on?
- Is the library on the system drive ?
Maybe the folders/files weren't deleted, but moved - have you tried searching for the lost files. On windows I would run Recuva (3rd party util) to look for any clues.
It's hard to believe some other program would be stealing/deleting books and covers randomly - except maybe a dodgy backup file synch process.
BR
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Thanks for following up BR

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No. The Library is not synced to any cloud storage at all -or anything else.
I'm using Linux Mint, Cinnamon 17.2, 64bit; library is on file-system Ext4.
Yes, the Library is on the computer's hard drive.
You mean search the computer for the missing file? If so, then, as I said, my first thought upon realizing that a book is no longer showing up in the Library is to go to where I store all my original book files and re-add it to Calibre. So I guess, I'd find the file anyway since it's also somewhere else outside of Calibre's library.
Well, I do back up very often using the system's [Linux Mint] Back up tool. But then why only my book files as I haven't noticed any other files missing? -I probably need to do a thorough check on this now.