It is W10 so did you turn WU Sharing off?
Here's one idea how: http://www.howtogeek.com/224981/how-to-stop-windows-10-from-uploading-updates-to-other-pcs-over-the-internet/
I have a single LAN+Internet cable connected to each of my computers. One of my computers shows data usage of 100 GB for the last 30 days when I check the Data Usage in Win 10. But it shows it as single combined (Ethernet). I want to know the data usage over LAN and the Internet separately.
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