Hyper-V replication allows you to make a complete copy of a VM to another hypervisor (server) and keeps this copy up to date continuously. Thus, in the event of a total collapse of the main hypervisor, you, as the administrator of the virtualization environment, after making the decision “The main server cannot be restored and you need to run the VM on the backup hypervisor”, spend just a few minutes to turn on this VM with the amount of lost data no more than 0,5 .5 / 15 / XNUMX minutes (depending on setting). Moreover, if the guest OS is also Windows (from a generation not lower than the 9th version), then by using the VSS service in conjunction with the integration components, you will get complete even the DBMS databases that were working at the time of creating a copy of the data for the backup hypervisor.