You can analyze user Bandwidth user from webuzo User Panel > Server Utilities > Bandwidth.
What is bandwidth
The maximum amount of data transmitted over an internet connection in a given amount of time. Bandwidth is often mistaken for internet speed when it's actually the volume of information that can be sent over a connection in a measured amount of time – calculated in megabits per second (Mbps).
You can analyze bandwidth by date, month, or by year from this wizard