I've just run a quick test with a single epub I just downloaded--if you have the option ticked to search for URLs inside of books, and you select downloaded epubs and click update on them and select to update metadata on already downloaded epubs, it'll pull all the tags and everything it would for a download through fanficfare originally on your extant library. So you should be able to! (Make sure you tick the option not to delete any existing tags, if you've added stuff for your own organization already.) Ao3 did just update their EPUB format I think--unless that hasn't happened yet--but as long as the URL's in there it shouldn't be an issue how it's formatted.
I will additionally warn you that updating fics is rate limited so that you don't flood out the website(s), so if you want to update all 2k fics at once, you probably want to like, start it before you go to sleep and leave it overnight, because it will take hours. (First like half an hour to an hour to get all the URLs probably, and then once you confirm that list--I would guess at least six if not eight or more hours to update metadata on that many fics.) That's a large part of why I set up the email subscriptions, so I wouldn't have to wait for it to check a thousand fics and not be able to do anything in calibre while it was working.
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timeasmymeasure
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Date: 2019-02-12 04:41 am (UTC)I will additionally warn you that updating fics is rate limited so that you don't flood out the website(s), so if you want to update all 2k fics at once, you probably want to like, start it before you go to sleep and leave it overnight, because it will take hours. (First like half an hour to an hour to get all the URLs probably, and then once you confirm that list--I would guess at least six if not eight or more hours to update metadata on that many fics.) That's a large part of why I set up the email subscriptions, so I wouldn't have to wait for it to check a thousand fics and not be able to do anything in calibre while it was working.