THANKS for this post, I was discovering recently the witness aspect of Steem, and I was looking for information on how to set up a server. I will read this with great care.
How much monthly bandwidth does a witness require?
Ah you're the CEO of @privex? Nice.
For a witness, I'm not entirely sure. For a seed the bandwidth requirements are higher because you're distributing blocks.
Since I set up my witness a few months ago, here's what my network stats look like:
RX bytes:114048278566 (114.0 GB) TX bytes:99253351124 (99.2 GB)
So it could require 20-30GB a month, I really don't know.