Thank you, Harry. My big concern is that, should Amazon disappear in the future, I still have my own copies of files and access to all my books. On my Mac is fine (though ideally, if Amazon went away, I'd hopefully have another device besides my computer on which I could read the books, though that obviously doesn't work for Kindle now.)
I don't want to make the investment in a Kindle and book collection if there's a risk it might disappear without my having access to it, even if that were to happen 10-20 years from now. Again, I do know it's unlikely, given Amazon's profitability and diversified sales, but I have to protect my own business, too
