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I believe there are backup tools for the Kindle that strip out the DRM and save the books to your PC.

But essentially this is the same risk as your house burning down and taking your books with it. I wouldn't lose sleep over it.

I have home insurance, so if my house burns down I get the cash to buy replacement books. I doubt that they'd pay out if Amazon shut down Kindle.

I think amazon has shown that they at least pay you back after they take away your book. Not that its good that they can take away your books though.