Quote:
Originally Posted by paulfiera
Now, if I ever want to put some of those books back in my library, is it enough just to add the epub or should I do something with the opf file?
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The opf file has all the metadata from the calibre database associated with that book (except the cover, which would also be saved with the opf file if you have the right option clicked). For a format like TXT you would need the opf file, as TXT does not store metadata internally. However, the EPUB already has the metadata inside, so the opf is duplicative. That said, I prefer to keep the opf file. When importing, if the opf file exists, Calibre will read it and accurately restore all your metadata. If you import without it, you will need to set the import options to read metadata internally from the EPUB, and by default, my settings are not set that way.