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Thanks for the info and the link. What about my second question? Any insight into it?
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Thanks for the info and the link. What about my second question? Any insight into it?

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In 2008 HyperV R2 I can add a physical disk to a VM. &nbsp;<br />
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1) Are there any size limitations on that versus a regular VHD e.g. what is the max size of a regular VHD versus a physical disk VHD?<br />
<br />
2) When I add the physical disk as a VHD and I run Windows 2008 R2 Server backup will it also backup the physical disk VHD just as it does regular VHDs? For example if I have 4 VM's on a host with 4 VHD's attached to them and I run Server 2008 R2 backup I will create a complete duplicate of the host that in theory I can restore to a different server if necessary. &nbsp;Does this still work if one of the VHD's attached to one of the VM's is 'physical disk'<br />
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I believe the other terminology for physical disk is pass-through
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In 2008 HyperV R2 I can add a physical disk to a VM.  

1) Are there any size limitations on that versus a regular VHD e.g. what is the max size of a regular VHD versus a physical disk VHD?

2) When I add the physical disk as a VHD and I run Windows 2008 R2 Server backup will it also backup the physical disk VHD just as it does regular VHDs? For example if I have 4 VM's on a host with 4 VHD's attached to them and I run Server 2008 R2 backup I will create a complete duplicate of the host that in theory I can restore to a different server if necessary.  Does this still work if one of the VHD's attached to one of the VM's is 'physical disk'

I believe the other terminology for physical disk is pass-through

Windows 2008 Hyper V R2  - physical disk questions

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

Disaster Recovery is the planning for and creation of policies and procedures related to the resumption or continuation of an organization's functions following a catastrophic event. The term is most frequently used in relation to failure of networks, but DR preparations also include other business systems and personnel considerations.

Disaster Recovery

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.