I only keep unread books on my Kindle. I typically have anywhere from 1200-1500 books on my Kindle at any given time. I do this because once I have finished a book, never sure what I want to read next so I keep a nice selection of all types of books on my Kindle. Once I finish the book, then I delete as I have a copy of the book in Calibre that can be reloaded if I decide to re-read.
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