how make diablo 2 exp l.o.d. backup

[bidule]

please help me . I want to know how i can make a backup of diablo l.o.d expension . I have make a backup of my install and it work but i do the same thing for l.o.d. backup cd and nothing . the copy protection is the same i am lost please help me
SORRY for my bad english. have a nice day and thank for all