At the moment I'm running a few of my machines on a very remote site off a 4G modem router, which has a 25GB per month SIM in it. For the past couple of months, it's run out of data which has caused annoying downtimes and forced me to make visits to the site which are becoming costly! In trying to get to the bottom of this, I have discovered that one of my rigs with 2x GTX 970s in it is reporting that F@H has transferred 9GB of data in the last 30 days. Now, if two cards in one machine are using 9GB then it's fair to assume that the other two single card machines are using a similar amount, so there's an estimated 18GB of data that F@H is using per month on 4x cards... And if you take into account all the other things like Windows updates, Teamviewer sessions, Dropbox syncs and so on, it's not hard to see why they're burning through 25GB per month. At one point I added 10GB to the account on a Friday and came back on Monday morning to find that it was only a few hundred megabytes off running out again... So, why is the client using so much data all of a sudden? Because this never happened before, it's only started in the past couple of months. Can you suggest any way to prevent this?  Here's the data usage for the dual card machine over 30 days as reported by Windows 10. Also calling into question what's going on with the 4.36GB that Firefox is using in a 30 day period on a headless machine which is dedicated to folding and doesn't even have a keyboard, mouse or monitor attached to it 99% of the time, and the 3+GB that CAM (which is an NZXT app for controlling fan speeds through a Grid+ fan controller) is transferring.