Starting Feb. 26, 2025 (via ZDNet) you will no longer be able to download copies of your Kindle books and use those files as a backup. After that date, you will only be able to download books via Wi-Fi or through the Amazon platforms. //

All in all it is a reminder that you don't actually own many or most of your digital purchases, as what you are typically actually "buying" are licenses to use content that can be revoked at any time.