Wanted to post this to make people who aren't aware or that backup their books.
Hopefully you can back them up before it happens.
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"Starting on February 26th, 2025, Amazon is removing a feature from its website allowing you to download purchased books to a computer and then copy them manually to a Kindle over USB. It’s a feature that a lot of Kindle users are probably not aware of, given books can be more easily sent to devices over Wi-Fi, but it’s especially useful for backing up purchases or converting them to other formats compatible with non-Kindle e-readers."