...Hyper-V Replica is a new built-in feature of Windows Server 2012.  Hyper-V Replica enables Hyper-V hosts or clusters to enable distance replication of running VMs to remote Hyper-V hosts over a standard IP WAN connection.  It provides a very cost-effective disaster recovery solution in the event of a primary data center outage. To get this feature in the VMware world, we'd pay gobs of extra money to license "Site Recovery Manager", but in Hyper-V it's just included as part of the core feature set - no extra cost.  For more see it here and for great reference links check out here!