Working with VM replication sets (Windows) : Microsoft Hyper-V checkpoint replication sets : Creating a Microsoft Hyper-V checkpoint replication set : Specifying replication item options
 
Specifying replication item options
In the Specify replication items options page, the Max gen value refers to the maximum number of checkpoints of the replication target virtual machine that will be available for both failover and failback. The allowed range for a VM replication set for Hyper-V is 4-47.
• Retain the default setting unless you have specific checkpoint requirements and then click Next.
F1 Help: "Set Properties - Items tab"
NOTE:  A VM replication set does not send or back up any data to DS-System.