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I too, thought, "Oh, here we go again".
It WAS refreshing to see a genuine take on the 'hot topic' Lady F referred to.
My answer:
As has been stated, they're taking up space. My view is that I'm converting a book from an 'original' file for a reason, and so, after I've tweaked metadata and ensured the integrity of the conversion, I have no need of the original at all, and I delete it. I see no need, personally (and this IS a personal wants-or-doesn't sort of thing) to make backups of inferior copies of books.
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