I should have added a couple of things when I posted. For backup, I do recommend doing both cloud and hard drive as well as your computer and flash drive. Excessive? How much did you pay for all your ebooks? No different from family photos. Google provides free space - more than enough for most people's ebooks and the most important of your photos.
Second, you can forward books into your account on Amazon (send-to-kindle). However, you lose the font options available having azw3 format. I still do send such books to my sister, but she doesn't 'keep' books once read.
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