Hyper-V replicas in Windows Server 2012 and Hyper-V Server 2012 let you replicate and synchronize virtual hard disks and complete virtual servers asynchronously between various Hyper-V hosts on the network. A cluster is not required. You can perform the replications manually, automatically, or on the basis of a schedule. If a Hyper-V host fails, the replicated servers can be switched online.
To make a Hyper-V host available for replicas, you will first need to enable and configure this option on the appropriate server in the Hyper-V 'Settings->Replication Configuration' feature. Here, you define the data traffic and the servers from which the current server accepts replicas. Thus, you need to enable this feature first on all Hyper-V hosts.
If you are using Hyper-V Server 2012, you can also manage this server using the Hyper-V Manager on a different server and create the same settings in this way. There are no differences from the commercial editions of Windows Server 2012. Make sure you enable the Hyper-V Replica rule in the advanced firewall configuration (wf.msc ) named 'Hyper-V Replica HTTP Listener'. There is also a listener for HTTPS.
If you want to replicate a virtual server on another Hyper-V host with Windows Server 2012 or Hyper-V Server 2012, then after configuring the host, right-click on the appropriate virtual server and select 'Enable Replication'. This step launches a wizard, in which you specify how to replicate the selected server from the source host to the target server. The virtual server on the source server will remain the same.
In the wizard, you also set the target server and the authentication type. What authentication the destination server accepts is defined on the target server in the Hyper-V settings (Replication Configuration ). You can also use the wizard to define which virtual hard drives you want to replicate. For the replication to work, you must enable the rules for the HTTP or HTTPS listener (depending on the traffic type you want to use) on the target server in the advanced settings of Windows Firewall (wf.msc ). The rules are already there, just not enabled.