There are many options to mine a profitable coin these day. I think MASS coin as listed here is a good coin to mine. If you have TBs of data that is going wastage then better invest that storage to some coin like MASS.
there are many data centers where thousands of TBs of HDD is residing. These Data centers can use this to get some profit. Its good since MASS PoC doesnt degrade the performance of system that is taking part in the mining process. So such installations MASS is no doubt a heaven.
Better then going it wasted, you can use free HDDs for mining and they can earn enough money for you to pay some of your utility bills. If MASS values go up in future it can give you good amount of revenue also.