Thanks for your help! Any idea how I check for updates that are stuck? There is nothing obvious that I can see and I don't remember updating anything recently. The massive usasge was just this labour day weekend and I didn't update anything that i remember. The only one i have is creative cloud (adobe) and those updates tend to be under 500M.
I'm looking at the activity monitor (network) and don't see anything unusual but it only shows me current usage not history so don't know how to look at what happened those particular days.
Thanks again!!