The amount of rewards you get depends on many factors. In test group C the payout algorithm has no yet been implemented, meaning that you only get rewards when a batch payout is done by the team, this currently is once every month. When the micro-payment algorithm is implemented in the near future you will get rewards more often. You get payed by the amount of data you store. There is a difference between the amount of free space you offer to the network and the amount of that free space that is actually used by the renters, which is the space you get payed for. Currently you get payed for not only the amount of data you store but also for telemetry reports and the amount of throughput of data in GB/h. As the project is currently in BETA many parts of the network are constantly being updated which means the network doesn't work like a fine tuned and oiled machine yet. Meaning that allot of free space is not currently being used up by renters, so as long as the amount of uploads don't rise, the amount of used space on one farmers disc will not grow very fast. I don't think anybody has 3TB of data stored yet on their disc so far ( i might be wrong). Be patient, start uploading, and spread the word, this will eventually help filling up your disc and earn you more rewards.

https://storj.readme.io/docs/getting-started

https://github.com/Storj/core#