AD Replication between 2003Standard and SBS (DC)

[realized]

I currently use 2003SBS which works fine and it’s our DC, I also have now a 2003 Standard machine which I would like to use as our Backup Machine.

Where can I find information on AD Replication including any MSDE databases I might have etc?

Is this possible with SBS (2003) being my DC and 2003Standard being my backup?

[markajm]

MSDN is a good place to start looking for more info MSDN

but note that there are limitations as to what you can do with SBS. It is designed for Small business that would only be running one server anyway.

from the Wiki:

SBS server has the following design considerations: [8]

Only one computer in a domain can be running Windows Server 2003 for Small Business Server. 
Windows Server 2003 for Small Business Server must be the root of the Active Directory® forest. 
Windows Server 2003 for Small Business Server cannot trust any other domains. 
Windows Server 2003 for Small Business Server is limited to 75 users or devices depending on which type of CAL. 
A Windows Server 2003 for Small Business Server domain cannot have any child domains. 
Terminal Services only operates in remote administration mode on the server running SBS 2003. (Change from SBS 2000 policy)[9]

[fizban2]

you can have additional DCs as part of the SBS domain, but you cannot add a SBS server to an existing domain