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Buy a physical Kindle (make sure a s/h one isn't blacklisted).
Register to your account.
Go to Content & Devices and download for PC transfer via USB to that Kindle.
Download all the BOUGHT files. Back up that. Do not download Kindle Unlimited files, if available, as they are not owned by you, that is a subscription library.
Copy and paste your Kindle serial number from Device in Content & Devices.
Do not ever make that serial number public.
Don't ever upload or shared the downloaded files. Don't use any Internet / Cloud backup. An extra USB HDD in a padded cash box kept at a relative/friends house.
Install Calibre and download the deDRM plugin from the NoDRM Git site. Put your Kindle serial number in that.
Load all the downloaded files into Calibre. Use Calibre's backup to make a backup. Store an offsite copy.
Note MS One Drive, Google, DropBox etc are NOT backup solutions. Best viewed as collaboration, sync or sharing solutions.
Only give files you write or Public Domain ones to other people.
If you don't do this as a minimum, then despite when you go to Amazon ebook page of a bought Kindle ebook having "You own this", you do not have any archive of what you bought.
Some Kindle ebooks have no DRM (publisher request), but Amazon puts DRM on all titles that should not have DRM if the KFX format is used (direct download to all but oldest Kindles and by default PC app and Android App. The iPhone & iPad works differently with Amazon and I don't have either.
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