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This is actually more complicated than you think. If Calibre's database isn't aware of the backup then it will be deleted as soon as you tweak the book title or author. Agree that it would be nice though. If the book is already in decent shape I always do this manually for same source to same source conversions - just hit the 'O' button, which will open the window in a file manager, and duplicate the source file, and then run the conversion. I also keep a backup of all my files online, so if something went awry I could always restore from there.
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