No idea. Some redundancy would make it more robust, but may come at the expense of user experience. Email it to somebody?

anon

Do you not understand that the solution should address mainstream usage and not for nerds?

rsync kills the entire premise. You might as well use a metal plate. Same target users...

rsync, you provide the server and ssh secret key in a config setting.

there are also comercial rsync backends, like rsync net. 

standardcrypto

That's definitely an interesting edge case, with this design you could keep the encrypted backups anywhere, where would you suggest?