There is/are PREFERENCE settings to handle Duplicates when copying between Libraries
preferences:adding books (main tab): mainly Items 2 and 3
BTW I do NOT recommend using any OS copy tool, those do not maintain the Calibre DB
BTW If Calibre CAN switch between existing Libraries, you Toolbar preferences may need readjusting
Add Copy to Library to the CONTEXT menu(s) Remember, there are separate settings for When a device is attached (or not)
|