Originally Posted by BetterRed
Is it same same drives as Linux and software, reason I ask is; if it is then its unlikely that a hardware fault would only effect calibre library data and not more critical things that Linux itself needs.
Yes, the same drive as Linux and software. Has only the 1 drive.
Yes to see if the lost files have been copied to some obscure location. Many (most ?) 'calibre lost my books' issues are caused by the folders/files being moved by someone/something - often as a result of mouse drag and drop slips.
I don't have any lost books at the moment so a search only turn up those in my Book folder. [I'm the only one who uses this computer]
Search for the calibre file name 'author - title', you might find the 'missing' files in a 'how did it get there' location - eg your music library  Or, search for the book format you lost (e.g. EPUB, MOBI or AZW3 etc) and sort the results on location
Not familiar with Mint Backup - but if you backup the calibre library(ies) along with everything else then "why only my book files" indeed 
Suggest you resolve the existing anomalies from Check Library, and then run it regularly, you can do that from the command line see calibredb --check_library command. I run it at end-of-day, and look at the CSV next day, if something does go awry I usually (always ?) know who to blame 
I'll see what happens when I run Check Library again when I'm done.
BR |