So I'd like to gain some insight into which processes (incl. daemons) upload and download how much data on my Debian 9 machine.
Sadly the System Monitor does not display such information. I'd prefer a GUI over the console. I have tried
nethogs which is probably what people would recommend for such endeavors, however it only shows the current network traffic processes instead of cumulative information such as a proper statistic or ordered list. I'm aware of wireshark.