I am a bit more anal. I keep all of my books in Calibre - I download the books I buy at Amazon, and keep those in Calibre as well. Once a week, I back-up my computer to a portable hard drive. But I also have Dropbox back-up for my library, and I have an SD card that I have labeled books. So, I have it backed up three ways. I have broken computers and lost kindles, so I have learned my lesson about back-ups (I hope).
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