Backing Up Games on a Macintosh?

I was just watching an online show called From the Shadows, and in one part they showed how to backup your computer games so you don’t have to fumble around with discs and stuff. The problem is, they show how to do it in Windows. I have a Mac with OS 10.4. Is it possible?

And no, I’m not just trying to do this to get games from my friends, infact, I don’t know anyone that has a Macintosh and plays video games.

Thanks a lot,
-Andy

Umm… there are games on a Mac?