Currently Being ModeratedDec 1, 2012 1:51 PM (in response to mervincm)
I've never seen a way to do that for a Mac that shipped with ML. The very first thing I'd do with such a new Mac is clone the hard drive to an external drive and then never touch that partition for anything but to boot to in order to clone it back to the main drive as a "fresh" install.
You can use Disk Utility to create a clone, or either of two excellent third party choices; SuperDuper! and Carbon Copy Cloner.