I always replace ugly plain-text covers.
For the rest it's 50/50. I keep original cover if there is at least some artistic effort made and add coverart / alternate / 1st ed covers to the end of the book. If the book is a favorite, it may well get some fanart pics too.
I've added rar-file to some books in Calibre, as a place to keep original pics (if art was too big), alternate covers I did not add to epub but liked, fanart, coverart, maps...
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