It should not. Backup means a good OS system + drivers + most used apps. For Windows, all of us know it requires repeatedly update. My backup always goes up to the latest at the time of installation. Before the backup, I will also clear up the temp files.
For bootable DVD, did you try pebuilder in the past or winbuilder now? The program in the past allows multiple windows OS into a CD and other programmes to use in CD booted WinPE environment.