Insane data usage?

I've got a 950(through work) and while talking to someone about Mint, I went to go look at my own data usage. I was shocked to see I'd used 14.3GB in the last 30 days. 1.61GB on AT&T. When looking at details, AT&T shows 1.32GB for "System" and 7.97GB for WiFi. I jumped on AT&T's site to see my previous data usage and October was kind of high(I was on vacation for a week, so that makes sense), but the previous 6 months were all half a GB of usage.

How do I track down what "system" is doing?!?

from Windows Central Forums http://ift.tt/2jDgiPp
via IFTTT