There is no way to run a backup of your shares automatically through the console. The Windows Home Server server backup tool is designed to allow you to easily back up your shares when you choose (and to do so in a storage-efficient manner, because it uses hard links for files that haven't changed), but can't be scheduled.
What I do is use robocopy, in a scheduled task. (I also rotate drives off-site weekly.)
I'm not on the WHS team, I just post a lot. :)