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As long as you have your account info at the various online book retailers, you should just be able to redownload your past purchases. Wherever I've purchased books from, I've noticed that I still had the option to do that, or to download different formats of the same book.
But to make things easier for myself, I always have a copy on my PC as well, and I backup the full drive every few months by cloning it for safety, so I usually have at least 3 copies to get anything back much quicker.
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