Just throwing out an option if you aren't aware, gohardrives on ebay and on their site sell used Hdds. 10Tb for $80. The catch is they've been used in data centers for 5 years. The company will guarantee the drives for an addition 5 years and it could save you a lot of money depending on how much you want to risk it. I went with 3, one being a parity drive in case other goes bad.