Find the folder the Sony software saves them to - on my computer it's in My Documents\My Books\ and I have two folders in there (CONNECT Reader, from the original software name, and eBook Library, from the newer versions).
The LRX books are the DRM'd Sony formatted books, LRF are non-DRM'd. For ePub, as far as I know, you have to open it to know if it's DRM'd. But you can copy those elsewhere for a backup.
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