Not being familiar with the Sony bookstore, I don't know if they allow you do re-download your books or not. Typically at ePub bookstores there's something like a "My Account" section of the store where you can see your past purchases and re-download them. Does the Sony store have nothing of that nature?
A hint for the future: keep backups of EVERYTHING. You are the only one who can guarantee to keep your files safe. As soon as you buy a book, strip the DRM and keep the file somewhere safe. That's the only way to make sure that you'll have it in the future.
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