Working with VM replication sets (Windows) : VMware vSphere snapshot replication sets : Prerequisites for VMware vSphere snapshot replication
 
Prerequisites for VMware vSphere snapshot replication
For successful VM replication, do the following:
Ensure that the version of the virtual machines to be replicated is supported in both the source server and destination server.
Ensure that VMware Tools is installed on the guest operating system of the virtual machine for application consistent snapshots.