I first remove DRM from all purchases, no matter where I buy a book from. If it's an Amazon book, I keep that original DRM-free azw3 (or azw or mobi) in my Calibre Library along with a conversion to epub since that's what is sent to my ereaders. That way I still have the original just in case Amazon ever makes an ereader I actually like and would use daily, or need to reconvert to something else down the line. And Calibre Library is backed up on several hard drives and in the cloud.
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