For his recent talk on the #MicroMirror project, @warthog9 was kind enough to go run the numbers and plot ALL of the traffic we're logged from these servers.
We have served, to this date, over the last 18 months, 18.6 FREAKING PETABYTES of Linux and free software updates.
All from a fleet of tiny servers funded by cash donations and ISPs which are willing to plug these silly things in for us.