Usage depleted overnight. All updates set during free time.

Then just check your data usage before going to bed and unplug the LAN cable from the back of your modem. Plug it in when you get up and check the usage again.

There is a delay in the meter so if you just finished downloading something big prior to unplugging a significant difference might show but if you are just browsing there should not be much difference. Doing that every night for a week will give an obvious conclusion as to where the problem is happening without jumping through all the other hoops.

I thought you were reporting a big drain in the daytime while you were just browsing.

Have you set McAffee definitions and program updates to not happen automatically?

Sorry for my mistake.

Ron