[Veratyr]

They support RAW files: https://www.amazon.com/gp/help/customer/display.html?nodeId=...

This makes it superior to Google Photos for backup in my opinion. Amazon provides free (with Prime) backup with no limits, RAW support and no recompression. Google Photos provides it for free but with lossy compression and without the possibility of retaining the range of RAW.

[xur17]

It definitely makes it superior to Google Photos for backup, but Google Photos is drastically superior for viewing your photos. Automatic face detection / grouping, and really good search functionality help a ton.