How do I create Mountain Lion bootable external hard drive

How to create a disk external drive bootable in Mountain Lion and then retrieve a Time Machine backup external of Cougar on this Cougar bootable external hard drive, while maintaining the operating system of my computer and files intact.

Forget why I do this, I tried to enter a question in the reasons previous and which led to a lot of confusion as to why I need to do this and why not try something else instead. That's what I do, please just answer how this and only this.

Thank you!!

If you need the Setup disk, it's here

http://www.Apple.com/shop/product/D6377Z/A/OS-x-mountain-lion

When you start with the Setup disk, choose to install it on your outside.

Mountain lion to install it on the HARD drive. TM backup on the same drive recovery

OS X Lion mountain: restore your entire system

Tags: Mac OS & System Software

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