I currently use SyncToy Powertoy to synchronize my pictures and music folder on my laptop to a NAS drive. This way I always have my photos and music available on my laptop but also have a backup on my NAS in case anything happens to my laptop. I understand the way the WHS works is by putting all your content on the WHS. This will not let me have a copy on my laptop so I can access it without an internet connection. Also the backup feature doesn't allow for seperate types of backups for each machine. If it could, then I could have a system backup as well as a media backup.
What I am suggesting here is that the WHS has the same features of the SyncToy and allow directories to be synced between a home machine and the WHS.