Question : Problem: dhcp backup server

adding a backup dhcp server

Answer : Problem: dhcp backup server

You cannot have a backup dhcp server.
But you can have a secondary DHCP server which can partially lease ips.
There was a 80.20 rule in early 2000 for the servers for the IP lease.
see below as well.

http://www.windowsdevcenter.com/pub/a/windows/2004/04/13/DHCP_Server.html
http://technet.microsoft.com/en-us/library/cc728300.aspx

--popularbhaskar