I've witnessed data transfer I've never seen before!
I got 17.17.4 last night and today I drove ~100 miles with it. I just got back to my garage at ~935 PM and immediately opened my router app to look at the network traffic. I've done this a lot with prior updates out of curiosity and the car usually does a quick spike of up/down not lasting more than 10 seconds (I imagine syncing some basic state).
HOWEVER. Tonight, it uploaded at a constant 168 kbps (kilobits per second) for over 10 minutes. Behold! Of course the moment I took this SS it was at lower than 168 kbps but it was only for a moment. My home upload speeds are well over 100 Mbps and the fact it stayed at 168 so solidly for so long leads me to believe it was a purposeful upload throttle on the remote end.
Doing some back of the napkin math, my Model S uploaded anywhere from 12 to 15 MB (megabytes) over 10 minutes.
Is this the video clips it recorded during the day perhaps?