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Sony hides the file where your purchased downloads from them are stored. Search your computer for a book title and find the folder, then just copy it.
I keep a folder on my desktop that is imaginatively called "ebooks." Everything gets backed up to it, no matter where the book came from.
NOW THEN....
You can re-download purchases from most legitimate sellers if you lose your copies.
From Fictionwise, some books can be downloaded in multiple formats in order to back up your purchase in every possible way.
Books borrowed from libraries using the Overdrive system will expire and stop working on the date they tell you that it will happen. Makes no use trying to copy those, because you can just re-download them again if you are not finished. (Note to self: Finish Unseen Academicals quickly before it expires.)
Amazon can and has deleted books from owner's devices via the Whispernet. I think the solution was to turn that feature off. Except that is the basic reason for getting Kindle.
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