Last year I started using rclone [1][2] to upload photos to Amazon Drive using the "unlimited photos" tier included in Prime. Soon after that offering was given another interface to the same backend -- and that other frontend, "Prime Photos" [3] would automatically turn on ML-scanning on your photos on first login. So I nuked everything, flipped the setting to "off" after a few days, and uploaded everything again.
In January 2017, the last time I logged into either interface, both of them were still accessible and surfaced the same content [4], but I don't know if the two products are going to evolve separately in the future. Using a solid alternate client like rclone, I'm able to sync up my current photos to Amazon Drive on a schedule.
This is a good solution for photos especially if you're already paying for Amazon Prime, but does not address video. I'm experimenting with Backblaze's B2 as one of the least expensive object storage providers, but after doing some napkin math it may be cheapest of them all to get Backblaze's unlimited backup service for $5/month (= $60/year), which then solves both my document and media backup issue in one integrated go, as opposed to having to piecemeal from comparably- or more expensively priced cloud storage vendors and have to devise and maintain separate backup strategies for each.
[1] https://news.ycombinator.com/item?id=12398303#12407606 [2] https://news.ycombinator.com/item?id=12398303#12407606 [3] https://news.ycombinator.com/item?id=13321503#13322296 [4] https://news.ycombinator.com/item?id=13321503#13322631
