My Retina Mac came with 10.8, how can I make a bootable copy of 10.8?

My Retina Mac came with 10.8, how can I make a bootable copy of 10.8?

Do Internet recovery, download the installer, choose an external HD to install it to, when the comp restarts, disconnect the External HD before it turns back on.
Extract the Install.dmg and put it on your desktop, then use disk utility to install that onto your external HD.

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