rsync.net is an amazingly simple, fast, and flexible backup solution. I’m using it with borg backup on Linux and with Arq on macOS. I also transfer files to it manually via SFTP (via Transmit on Mac). It snapshots your files with ZFS, which is really cool. Today I learned that it also supports nativeZFS send/receive, which is totally unique among cloud services that I know of. Unfortunately, to use that feature, you need a special account with a rather large minimum 5 TB quota.