I feel so glad I retrospectively moved all of my ebooks away from Amazon at the beginning of the year. It was weird to hear just days after I exported it all that Amazon had announced they would no longer allow downloading for USB transfer.

Now I have all of my epubs, unlocked, DRM-free, backed up, and I place them on whatever my ereader of the time is (currently Kobo), or read them on my own self hosted web reader.