Vista should have a rudimentary backup/restore program. Now whether or not W7 will be able to restore from that file is another thing. (it should)
You only really want to backup your data. But if you want, a full complete backup of your Vista partition could never hurt, but it's more work.
I'm quite experienced and am looking for a solid solution that allows me to back up a whole volume onto a terabyte drive and create an emergency/restore CD.
I don't mind the work. I got nuthin' but time here. :0)