Answer
About 860 GB per day. In review, anything from 430 to 1,720 counts as right.
The worked estimate
1,000 × 50 × 200 B = 10,000,000 B = 10 MB/s. × 86,400 s = 864,000 MB ≈ 860 GB a day, roughly 0.86 TB, or over 300 TB a year if all of it is kept. Short retention and compression make that manageable.
Numbers: Numbers to know.