Create boot disk clone\image from OS

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http://serverfault.com – I have disk with Windows Server 2008 R2. I want to create image\clone of this disk. I want to be able to do that from OS. So I want to clone disk I am currently booted from to another disk. Then I want to boot from this cloned disk. Is it possible to make bootable disk image\clone from OS level ? What is the best way\tool to achieve this ? (HowTos)