Quote:
Originally Posted by toddos
Keeping at least the opf file separate is good in case your calibre database ever corrupts. Calibre can rebuild its database from these opf files, but only if you're generating them. They should not take up much space, so I don't know what benefit there would be to turning them off.
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Save to disk has an option to EXPORT those files along with the selected format.
I believe that is what the OP is asking about.