Thanks for putting this info together.

I've been using Amazon Photos as tertiary backup for a few years now. Yes, organization is terrible - I can't even hide my raw files from the browser - but both raw and exported files count as 'photos'

As long as I'm a Prime subscriber, it's effectively free - so if there's a disaster that destroys my Synology Diskstation and all sets of backups, I'm not SOL. If I drop Prime, I'll probably use Glacier for this (cheapest per-byte long-term cloud storage)

BTW/FWIW, If you have a Diskstation, and are a Prime subscriber, you can use a Diskstation app "Cloud Sync" to deal with uploading to Amazon. Easy to set up, and easy to set so it runs in the 'off' hours.

I've been using Synology "Photo Station" to put together any albums I want to share (requires a static internet IP or dynamic DNS - which I have already set up), but it sounds like it might be time to check out Flickr again.