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Honestly, I just downloaded the Kindle app for PC and every time I buy a new book I drag it into Calibre and remove DRM.
My Kindle(s) do not really interact with calibre and, of course, it has no impact on syncing, annotations, or anything else in the Amazon cloud.
That was I can still benefit from the Amazon system - which, despite all of our complaints, is still great, especially if you own multiple devices - but have a backup, just in case...
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