Last month apparently I hit a new high for me: 890GB. Lots of devices needing updates/games downloaded...
I am really surprised that with a 7 person household you don't go through your data even faster.
I even run a local caching server for all my Apple devices, which over the last 30 days has saved me about ~50GB from having to be served from origin, with about ~100GB being served to clients.
Although I tend to also be a heavy user of Apple's iTunes and particularly their movies service, so I have a feeling a lot of that cached data is me putting movies on in the background and them being streamed from the cache rather than from Apple directly.
It is surprising how big docker containers get after a while.
I can get 400/35 Fiber to the Home with no datacap (no throttling either) for £54 a month (~$70).
UK average fixed-line download speeds in Q4 2017 were about 26 Mbps [1]. The same Q2/Q3 2018 statistic for the United States was over 96 [2].
American broadband is crappy. But in mean technological leadership, it’s ahead of the UK. (At the leading edge, I get 400/35 for $80 in Manhattan.)
I cut cable TV years ago and exclusively stream. I like having the TV on for background noise when home, even though I’m usually not actively watching it the whole time, and you’d be surprised how fast one can chew through data usage. I usually use around 1.5TB a month when you factor in offsite backups.