help please

[-BuGzY-]

hi im new to backing up computer games ....i currently own mafia,age of empires,warcraft 3 and empire earth, i have no idea how to go about this can some one give me a url or tutorial on doing this, ive burned them disk to disk but when i try them it asks me to insert original disk ..is this normal?........i have a:

buslink dvd rom and sony Dru 500a dvd burner

Thanks in advanced