I sent my old one, with a year’s worth of books, to my son in CA.....he promptly changed it to his name and lost all his books. I had to talk him through changing the name back and the books were all there. No going back for me.
When Jax started the Fire it showed “Jacqui’s 4th Kindle.” They replaced the first one twice over the course of the year, but she never lost a thing. I still haven’t figured out all the ins and outs of the old one, I doubt I will attempt to do anything with the new one.