The 2012 Olympics were an absolutely huge undertaking - the BBC went as far as creating a mock Olympics to test traffic and server load and at its peak shifted 2.8 PB of data a day. When Wiggins won gold, they were shifting 700GB/ps. No doubt things have come a long way since then - but I get the impression it really was no mean feat.

http://www.bbc.co.uk/blogs/internet/entries/2db7f335-660b-32...

http://www.bbc.co.uk/blogs/bbcinternet/2012/08/digital_olymp...