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rsync by itself doesn't support copying between two remote hosts, but if you use sshfs you can pretend one of them is local. If you have a passphrase-less ssh-key, you can even put this script into a cron job.
A faster alternative is to run ssh-keygen on remote1 and put the pubkey into remote2:~/.ssh/authorized_keys, running rsync on remote1 (or vice versa), but the problem with that is that now a hacker on remote1 can access remote2 at any time. The above method ensures your local computer stays the weak link.
Mac install ssh-copy-id
From there on out, you would upload keys to a server like this:
(make sure to double quote the full path to your key)
ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" username@server
or, if your SSH server uses a different port (often, they will require that the port be '2222' or some other nonsense:
(note the double quotes on *both* the "/path/to/key" and "user@server -pXXXX"):
ssh-copy-id -i "/PATH/TO/YOUR/PRIVATE/KEY" "username@server -pXXXX"
...where XXXX is the ssh port on that server
you can use this command for mounting local directory to a remost directory..