In P2P deployments, installation of vCenter Server Heartbeat provides support for Wbadmin on Windows Server 2008 for automated Install Cloning.
During install, vCSHB verifies that Windows Server Backup Feature and Command Line Tools are installed and then it uses Microsoft Windows Backup to make a backup of the primary that will be restored on the secondary. You can find more details in the
"Installation and Upgrade on Windows Server 2008 When the Secondary Server is Physical" http://www.vmware.com/pdf/vcenter-server-heartbeat-65-u1-installation-windows-2008-physical-guide.pdf