When you plug in your Kobo you can use Windows file Explorer to transfer back from the device to your computer, just the same as you would with a flash drive. Just highlight the files and drag and drop back onto your computer into a directory (call it "Books" or something you will find easily). Then you will have to go back into Calibre and do the "add to library" routine over again from your file called "Books". I may be wrong but I just don't think you can transfer the files straight back into Calibre's library.
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