making backups for my library

I just bought a PBG4, and it came with the Restore disk. I have two offices that I work out of, so I want to make copies for myself of the recover disk to keep in the office. How do I go about doing it? Do I just drag the image of the disk to the hard drive, then insert a blank cd and drag the image to the blank cd? What exactly is the procedure?

thanks in advance!