If you have a Kindle and "bought" ebooks over the years, you have a week to download and back up your files before Amazon blocks you from doing that.

There are scripts (see the thread below) that will bulk-download.

It's a reminder that Amazon is a rapacious monopolist.

https://www.mobileread.com/forums/showthread.php?t=366171

Amazon is removing Download & Transfer option - MobileRead Forums

Amazon is removing Download & Transfer option Amazon Kindle

@dangillmor Amazon has swallowed up so many great alternative book portals that they really do have much of a monopoly now. Abe Books and The Book Depository have been taken over. A lot of independents listed on Abe Books but now we have to give Bezos even more if we use the portal. It is tragic. Bezos is a very unlikeable person