On average, how much new backup data may be added per day to remain in a steady capacity state?

A file server-only environment is backing up data to a 1.0 TB EMC Avamar Virtual Edition server.
On average, how much new backup data may be added per day to remain in a steady capacity state?

A.
2 GB

B.
4 GB

C.
6 GB

D.
8 GB