Hi,
Source: cluster A, Destination cluster B. New cluster: cluster C.
Currently you have cluster A -->cluster B.
You could cascade the snapmirror and snapvault relationships from destination cluster to the new cluster. Cluster B -->Cluster C
Once the replication is complete, you can break the mirror and resync with original source. Cluster A --> Cluster C
Refer https://kb.netapp.com/app/answers/answer_view/a_id/1031864
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