the best way is to make a 100% perfect copy of it how ?
-first i used discjggler with my teac 532s reading speed at 1x
-second i burnt it with my teac cdr55s at 1x <=== yes it took a while but this is a perfect copy ;o)

other way to backup it use clone cd if your hardware is compatible with this software and only select fast error skip and reading speed at 4x clone is much more powerfull thant discjuggler so u can burn it a 2x with clone ;o)