Adding an additional server to an existing vault environment for High Availability

Hi,

I have an existing vault enterprise server cofigured for Exchange 2010.

My main vault server is a Windows 2008 R2 Standard machine

I would like to add a second vault server in a different location as redundancy. The goal is for us to be able to access the vault at all times. If my main server goes offline, the second one will take over and resume service. My main office and the remote location have site to site connection so there should not be a problem for the servers to talk to each other.

Is there any documentation out there or someone has done this before and can give me some guidance?

thanks