C&C Generals is protected with Safedisc 2.8x.
You can try CloneCD to make a working backup, but you will need a so called "two-sheep" burner.
Look at the website of CloneCD (i think it was
www.elby.org) and check if your burner has two sheeps at EFM encoding.
When your burner is capable to do this start clone cd and create a image using the "protected game" - profile.