The following procedure won't work with Active Directory-integrated zones, as the zone files are within the directory service and are not available on the filesystem.
On the nameserver, stop the DNS service using the Services applet in the Control Panel or through the command line.
Open the Registry Editor (select Start/Run, type regedit, and press Enter).
Navigate to the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DNS key.
Right-click the DNS folder, and from the context menu, choose Export.
When prompted for a filename, enter DNS-CCS, and choose an appropriate location that is off the server.
Now, navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DNS server key.
Right-click the DNS Server folder, and from the context menu, choose Export.
Name this file DNS-CV, and again choose a location that is not on the current server. These two files will be DNS-CCS.REG and DNS-CV.REG.
Now, using Windows Explorer, navigate to the %SystemRoot%\System32\dns directory on the boot drive.
Find all files with the .DNS extension, select them, and then copy them to the same location that you exported DNS-CCS.REG and DNS-CV.REG.