Though I can't be certain, I presume all of the preloaded books are DRM protected using Adobe Digital Editions (ADE) platform.
Merely copying them to the PC will not back them up due to DRM. Deleting them from My Books menu will mean permanent deletion, with no way to recover them which is not what I want.
I read from some very old threads that some users have successfully backed up their SQL database and the directories with the books to save them. However, this technique is based on very old firmware running on old devices. I am not confident enough to try them out on my device, especially when I have already sideloaded a lot of my own books. The database may get corrupted during the modification.
Quote:
Originally Posted by Aleron Ives
You don't have the option to delete the preloaded books from the My Books menu? You could copy them to the PC and then delete them locally on the device, rather than moving them.
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