Every Mac computer comes with a copy of the operating system that is installed on it. For Macs running on a version of OS X, you will have the version of OS X your Mac came with originally. If you ever need to troubleshoot your Mac, the OS X disks will become invaluable. In order to make sure the disks are kept safe you can make a bootable backup copy of them using Disk Utility to make the DVD into an ISO and then burn it to another DVD.
Step 1
Insert the Mac OS X Install DVD into your Mac’s optical drive.
Step 2
Open Disk Utility on your Mac. It is in the “Utilities” Folder in the Application’s folder or the Finder’s “Go” menu.
Step 3
Click on the Mac OS X Install DVD on the left hand side of the Disk Utilities window and select “New Image” from the menu bar. Name the ISO, choose a location and keep the format and encryption in their default modes.
Step 4
Click “Save.” Eject the Mac OS X Install DVD when it is done making the ISO. Do not mount the ISO.
Step 5
Click “Burn” in the upper left hand side of the Disk Utility window. Insert a DVD-R into your Mac’s optical drive. Choose “1x” for the burn speed and click “Burn.”
