Side loaded books on SD card stay when you sign out. All books on Kobo device memory are deleted. If your books are bought from Kobo and directly loaded from Kobo onto the reader sync with Kobo will again load the books. Books downloaded to ADE (Adobe Digital Editions) should be loaded again with ADE or with Calibre if DRM was removed and they were loaded into Calibre Library before for transfer to your Kobo.
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