Originally Posted by itimpi
What is your intended final use of the book?
However if you want the metadata held in the copy of the book inside the calibre library, then the final conversion step IS necessary as that what embeds the new metadata.
i wish it, for some security reason. I think - for example i lost metadata.db and will need to add books again and fetch ISBN again.. this is BIG headache... so, if i backup the calibre library and will sure that not only metadata.db and opf file secured, but epubs have metadata into the file - it will more convenient for me. May be i'm wrong... i just thinking how to keep collection - increasing - for years - safe.