You have a Hadoop cluster with $120$ data nodes distributed among $12$ racks, each housing $10$ data nodes. The cluster employs rack awareness for fault tolerance and data locality. Assuming each data block is replicated three times, calculate the total number of replicas needed for a data block stored on this cluster. If a file consists of $200$ data blocks, determine how many copies of each block will be stored. Explain the significance of rack awareness in maintaining fault tolerance and data locality in this setup.