Which feature can an administrator configure to have a copy of critical virtual machines in another cluster?

The feature that allows an administrator to create a copy of critical virtual machines in another cluster is vSphere Replication. This technology is specifically designed for disaster recovery and business continuity purposes. It enables the replication of virtual machine data to another location, which could be in a different cluster or even at a different site altogether.

With vSphere Replication, administrators can configure and manage how often a virtual machine's data is replicated, the bandwidth usage for replication, and the recovery point objectives. This ensures that in the event of a failure in the primary site, a consistent and current copy of the virtual machine is readily available in the destination cluster, allowing for quick recovery and minimal downtime.

In contrast, while other options like vSphere Storage vMotion facilitate the movement of virtual disks from one datastore to another without downtime, they do not create copies of VMs in different locations. vSphere Fault Tolerance provides continuous availability for a VM but does not deal with creating physical copies in another cluster. Instant Clone technology is primarily used to rapidly deploy VMs from a single parent VM but does not pertain to backing up or replicating VMs in another cluster for resilience.