Calibre is a Librarian (among other things). If you use the GUI to locate, and check-out (send to your reader), you have no need to know abour even where it keeps stuff. Calibre even made doing a FULL backup (books,setting and metadata, easy.. Right-click the Library icon:Export/Import all claibre data. (there are faster ways, but those take knowledge on usage and what/where to get it correct)
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