Hi,
One thing about DRM is that it can (and does in the case of Amazon) change which can prevent you from removing the DRM on your current books at some future time. Storing a current clean DRM copy is not enough without storing other pieces of information needed to remove the DRM (key files, kindle-info files, the software necessary to run the removal, etc).
The key point is that although stripping DRM is painless now, this can and does change (and did so quite recently - simply redownloading a book from your own Archive can recode it to the new version of the DRM once it changes) and you can't always rely on someone like ApprenticeAlf/IHeartCabbages/DarkReverser/etc to be around to find a new solution in the future.
So I strongly recommend to anyone that cares about long-term archiving of their purchases to take their current DRM versions and remove the DRM now and store the DRM-free copy someplace as a long term archive. Don't allow a future DRM change make all of your previous purchases "obsolete".
My 2 cents ...
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