This is something I really want, but I've never been quite sure how to set it up properly. Ideally I'd want to run it in the cloud so I don't have to be on my home network (and don't have to expose my home network in that way). I have a VPS that I use for a variety of things, but it doesn't have enough space for my photos. Syncthing doesn't seem to support S3 as storage.

I suppose I could put it on a machine at home, and expose it to the internet (perhaps using Wireguard), but I have very limited upload bandwidth (25Mbps), and would still want to sync the files to S3 (say with a script that runs nightly). I guess the initial sync would take forever, and then new photos would be relatively quick.

I guess I could also put it on my VPS and use something like Amazon's NFS service as the backing store. But I expect that would be quite a bit more expensive than the lower-cost S3/Glacier tiers I'd prefer to use.