Wow. I’ve only just started testing it against GP, but it’s really slick and works really well. Lots more fine control than GP, and the only thing that isn’t quite as good is the photo editing on the app and web site, and that is on the roadmap. Oh, and I can’t see how to set up TLS but I might just be missing something.
If you pay them, they host it for you: one copy on B2, one copy on wasabi and a backup on scale way.
If you don’t pay them, you need to provide a S3 compatible endpoint for storage, a postgresql database and a coordinator. Doesn’t need fancy stuff