Hi BalaJi,
I can't find explicit docs on Druid -> Druid data migration, but there is a page on the Imply doc site that discusses different scenarios for moving data from one cluster to another:
https://docs.imply.io/2023.05/migrate/#migrate-to-a-new-imply-hybrid-cluster
Generally it involves copying deep storage segment files and Metastore segment records over to the destination cluster.