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Adding a Windows Server 2008 R2 to a Windows Small Business Server 2008 Network

I am going to be migrating off the SBS 2008 server soon and in the mean time I would like to add an additional Windows Server 2008 R2 Domain controller to the exisiting SBS 2008 network.
Just incase the SBS dies, I want to have a backup DC.

Does anyone have exact steps to do accomplish this?   I do not want to move the FSMO roles over just yet, I just want the new server to be a backup DC.
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LifeFlight-IT
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LifeFlight-IT
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Cliff GaliherCommented:
There is nothing unique to SBS in this scenario. Take the machine, join it to the domain, dcpromo it, and if you want it to handle logins, make it a global catalog server.
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Cliff GaliherCommented:
Ahh, and if this is the first time your domain has seen an R2 DC, you will also need to do the standard forestprep and domainprep, but attempting to dcpromo would inform you of this as well.
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LifeFlight-ITAuthor Commented:
Do I need to run adprep.exe /domainprep & adprep.exe /forestprep
on the SBS first?

I thought the SBS must be the only GC?
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Cliff GaliherCommented:
You will need to forestprep and domainprem on the SBS server using the R2 media, as the media has the updated schema files.

SBS most hold all FSMO roles and be the root of the domain and forest. It must be a GC, but a domain can have multiple GCs thus it does not have to be the *only* GC. This is perfectly within licensing standards and is often used with SBS installations that have multiple sites.

-Cliff
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