What is the best way to make backup of WinXP?

I would like to make a backup copy of the WinXP CD and I’m not sure what app would be best. I have Roxio 6, Nero 6, and Alcohol120 installed. They all have disc copy features, but I don’t know what the difference is. So whats the best approach?

just copy it like a data cd, no magic needed. make an iso first if you only got one odd