I don't worry. I simply take reasonable precautions to avoid ANY loses. Not just ebooks. How much precautions depends on the possible loss and how much trouble/expense the precaution would take. Since removing the DRM takes maybe a minute per book, less if I bothered to set up the Calibre addon, there seems little reason not to take that precaution. Backing up those ebooks is just part of my regular backup schedule and takes no additional time. The possible loss of my ebooks isn't more significant than the possible loss of my other possesions but it is not insignificant either.
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