I have a EMC Vmax array at my primary site and one at my secondary site the distance is roughly 15 miles. I am using a product called SRDF/S and SRDF/A. which is a EMC array based replication tool. I have a RTO of 30 minutes. data rate of change is aprox. 50 GB per day how much bandwidth should I buy?

Help Me calculate the Bandwidth requirement using FC link or IP

Can some one help me?