This video is Part 3 in a 4 part video series on the steps required to upgrade an existing PKI from Windows Server 2003 to Windows Server 2012.  Although the steps demonstrated cover upgrading Windows Server 2003, the same steps could be used to upgrade Windows Server 2008 or Windows Server 2008 R2 to Windows Server 2012.  This video covers the steps required to backup a Subordinate Enterprise CA and then decommission that CA in preparation for the migration.

If you have difficulties viewing this video, you can also view it here: http://www.youtube.com/watch?v=ox61aZXACHQ