Synchronizing keys across cloned AWS CloudHSM clusters

Client-side and server-side synchronization are only for synchronizing keys within the same AWS CloudHSM cluster. If you copy a backup of a cluster to another region, use the key replicate command to replicate a key between two clusters. You might use cloned clusters for cross-region redundancy or to simplify your disaster recovery process. If you haven't installed CloudHSM CLI, see the instructions in Getting started with AWS CloudHSM Command Line Interface (CLI).