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Windows Server® 2008 R2 Hyper-V™: Insiders Guide to Microsoft's Hypervisor by Mike Sterling, John Kelbley

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Chapter 7: Backing Up and Recovering VMs

Companies often move to virtualization in order to separate a server-based application from at-risk physical hardware and thus guard against failure. When you migrate “that scary server in the corner that we don’t have the install CDs for anymore” to a virtual machine, you can perpetuate a key business function well into the future.

When you encapsulate virtual machine (VM) information inside one or more virtual hard disks (VHDs), you can easily back up, migrate, and restore server-based services and applications—something you can’t always easily accomplish with a physical server. A coordinated save or shutdown of a VM hosting an application without backup awareness allows an otherwise impossible recovery ...

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