I've seen a HN poster promote filestash.app which looks like it's either self-host or hosted. I guess you might have to add in something like Spideroak, Backbla

I've seen a HN poster promote filestash.app which looks like it's either self-host or hosted. I guess you might have to add in something like Spideroak, Backblaze, or tarsnap if you want to self host + backup. Or Syncthing as others have pointed out. I'm still thinking which is best.