@enuddleyarbl - Calibre Export/Import was not implemented as a backup tool, it's was created to simplify moving a calibre installation from an 'old' computer to a 'new' computer.
I suggest you do a search in this subforum for 'backup' in thread titles. And I recommend you use one of the folder & file synchronisation tools to mirror libraries and configuration, Free File Synch is popular amongst calibre users.
BR
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