06-06-2011, 11:22 PM
modelamac wrote:
Fairly simple.
When you download from the App Store, BUT BEFORE you install, you use Disk Utility to make a dmg file. You burn that file to DVD or put it on an external drive. You now have your dmg installer for backup.
As far as I can tell, you can't do this with the app store. The app store doesn't expose the .dmg file for you to burn. I could be wrong, but everything was automatically installed from app store for the apps I've downloaded.