Working with VM replication sets (Windows) : VMware vSphere snapshot replication sets : Creating a VMware vSphere snapshot replication set : Specifying replication item options
 
Specifying replication item options
In the Specify replication items options screen, the Max gen value refers to the maximum number of snapshots of the replication target virtual machine that will be available for both failover and failback. The allowed range for a VM replication set for VMware is 1-30.
• Retain the default setting unless you have specific snapshot requirements. Click Next to proceed to the next screen.
F1 Help: "Set Properties - Items tab"
NOTE:  A VM replication set does not send or back up any data to DS-System.