Quote:
Originally Posted by C-novice
Yes, the Library is on the computer's hard drive.
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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.
Quote:
Originally Posted by C-novice
You mean search the computer for the missing file?
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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.
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
Quote:
Originally Posted by C-novice
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. 
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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
BR