Backing Up To Hard Drive (Not Disc) Question

[Guru Imakuni]

I got a copy of Shinobi, but it's running on its last limb. I got it used and there's some pretty big scratches on the game, but it still works good. I'm not sure how much longer it will though. I don't have a DVD writer yet, but I'm preparing for the worst. What should I do to make a copy of it on my hard drive? Could I make an .iso file or do I need to do something special so all the data is taken?