we are planning to move our 30 node cluster from one DC to another DC
what would be the other approach that could be taken , considering , we are not setting any new cluster onto target DC for data replication as mentioned in below link
I beg your pardon, but your question is quite open-ended. Also, assuming with DC you would mean "Data Centre" and not "Domain Controller". Practically, first and the foremost is to have backup in-place before you start moving them. Others steps and recommendations will vary as per your specific architecture.