I recently built a secondary DNS to replace a failing until. It was pretty straight forward but took me a little bit to figure it out. I hope this helps you get it done faster.
To setup a DNS secondary you need to make sure that the NAMESERVER and ZONE TRANSFER are setup to allow the secondary server to transfer the information. Here are some good directions.
1. Primary DNS - Open the Forward Lookup Zones on the site you wish to sync with the secondary server. Right click on the DNS entry and goto Properties. Under the properties click on the Name Server. Then add your Secondary DNS name server IP address to the list. Then goto Zone Transfers and click the checkbox and choose the radio button for Only to servers listed on the Name Servers tab. Then save the information.
2. Secondary DNS - Open DNS MMC and then Right Click Forward Lookup Zones. Click on the New Zone.... The Wizard will show up. Click Next button then choose Secondary zone, then Next. Type your Zone Exactly the same as the Primary DNS name. Then enter the IP address for the Primary DNS server and click Add. Then click Next. Then confirm the information and click Finish.
3. You might need to check the new zone on the secondary DNS but if all goes well it should show all of the information exactly the same as the other Primary DNS server.
4. Now repeat over until all DNS entries are completed.
Note: I got these directions from the following website: http://support.microsoft.com/kb/816518
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