For additional security, you can back up the Active node in the vCenter HA cluster. You can then restore the node in case of catastrophic failure.
Note: Remove the cluster configuration before you restore the Active node. Results are unpredictable if you restore the Active node and the Passive node is still running or other cluster configuration is still in place.
Prerequisites
Verify the interoperability of vCenter HA and the backup and restore solution. One solution is vCenter Server Appliance file-based restore.