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Amazon’s killing a feature that let you download and backup Kindle books
(www.theverge.com)
This is a most excellent place for technology news and articles.
I upload books with Calibre and never had to reset anything. It’s great.
I have a kindle, but I never buy my books at Amazon. I just but them elsewhere, de-DRM then on calibre and copy them to the kindle. Not as comfortable, but okay for me.