You can do restic+rsync.net too if you didn't know. `rclone serve restic --stdio` on their end exposes the restic REST server over stdio, then with some fiddling of restic, telling it to use rclone as the repo address, and configuring its rclone args to actually invoke `ssh rsync.net`.

Again, with regards to my other comments, I am not affiliated with rsync, just rclone is cool. You can use the same trick with any host with ssh and rclone installed.