"Do you get enough control do to that on rsync.net?" Yes. You have your own .ssh folder in your account and can edit (upload) your keys as you see fit. Also,

"Do you get enough control do to that on rsync.net?" Yes. You have your own .ssh folder in your account and can edit (upload) your keys as you see fit. Also, if you have our ZFS snapshots enabled, those are immutable/readonly - so even if you aren't using a sophisticated tool like borg, you still have snapshots of your data that are immune to attack - even from someone who knows all of your credentials.