yep download dvd decrypter open it up, insert the game you wish to copy, then go to mode>>iso>>read this will copy the iso onto your pc hard drive then when that is complete but a blank dvd into your DVD rw then go to mode>>iso>>write and select that file, usually you would use the mds file to burn burn it slowly at less than 4x, then test. your ps2 will need a mod of some sort to read the dvd
I agree DVD Decrypter works better for games than Nero does. I have both and never use Nero at all. But it came free with my burner so that is why it is installed. here is a real good tutorial on using DVD Decrypter You can get it here at Afterdawn in the software section, i think under DVD rippers, or DVD Tools http://home.earthlink.net/~moderator/id3.html
use DVD Decrypter the same way you would with an original. It's no different backing up a back up than an original.