Vista - Selective restore.

Seeing that Vista's Backup and Restore are totally different, I have a couple
of questions before I screw my disk up complete.y. I have done my first
backup of "files". I was given no choice of the files and it appeared that
many files from areas other than My Documents were being backed up, including
stuff in Program files. My Vista System disk & data takes up about 20 GB.
Backup sounded like it was doing a full backup but managed to get it all on a
4.7GB DVD.

My questions so far are:
1. what is on the DVD and can I control the areas that are backedup?
2. why doesn't my WindowsXP C;\ partition show up as a choice to backup to?
3. why can't I backup over the net to my 250GB backup disk on my wife's
WindowsXP Pro system?

I want to try a restore, but only if I can select the file(s) to restore. I
am afraid that if I click on restore I will get no choices and it will roll
my whole system back in time. What options will I see?