How should the Cluster Vault installation be initiated on the second node?

To initiate the Cluster Vault installation on the second node, duplicating from the first node is the correct approach because it ensures that the second node has an exact replica of the configuration, policies, and any critical data that have been established during the setup of the first node. This method is essential in a cluster environment, where consistency and synchronization across nodes are vital for the system's performance and reliability.

When a second node is added to the cluster, it needs to be configured identically to the first node for effective load balancing and high availability. Duplicating the configuration allows the second node to connect seamlessly with the existing node, making sure there are no discrepancies that could lead to errors or service disruptions.

The other options would not be effective in maintaining the desired integrity and functionality of the Cluster Vault. Fresh installations would not carry over important configurations or data, restoring from a backup might introduce outdated settings or data inconsistencies, and connecting to a remote server does not apply in the context of creating a redundant node within the same cluster environment.