I am trying to back up my Calibre library on my PC laptop on my iMac. I have tried manually copying and the export function, with no success.With almost all the books I get the message "Book already exists in Calibre" (though it doesn't) and I cannot open (view) it. I have also tried deinstalling Calibre and reinstalling it to make sure it is empty, but that didn't work either. Obviously I am doing something wrong. Can someone tell me the best way to do this?
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