OK I am on my laptop running windows 7 ultimate now and have had a look at the options for the backup.
You can schedule them to run daily, weekly or monthly or not at all, and can let windows decide what to back up or select which folders you want to back up. You can also do a backup at anytime you wish.
I must admit I rarely back up anything on my boot drive as I can reinstall everything if needed and sometimes its a good thing to remove some no longer used programs or to update them to newer versions. I keep backups of programs, music, photos and videos etc on external hard drives and DVDs