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A more experienced member will have to help with the calibre question.
When I want to backup the books on my Sony 505, I have to make a copy of the file from where it is located on my hard drive. On my computer, they are under owner / documents / my books / reader library or under owner / documents / my digital editions.
I wouldn't worry about losing the classics. Most of them are found right here on MR for free and are much better formatted. Just download the ePub or lrf format.
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