Vista - Backup status and configuration.

Hi,
Can anyone tell me if the Backup status and configuration program from the
start menu\assesories backs up just the changes to your backup selection
everytime it is run? I backed up for the first time two months ago then
performed it again last month and the second backup is a lot smaller than the
first one i did so i am guessing it does just back up changes.

However if this is the case when it comes to restoring backups will i need
to restore every single backup log starting from the first backup i made?

Also i noticed it restore menu short cuts and program file folders but not
the actuall program, so when it comes to a restore should i restore the
program file folders first or reinstall the programs then run the restore to
restore the program files folders?

Very greatful for any insight available on this.

Sincerly

Joe