There's something like 40 petabytes of data on there, give or take, and billions of stored websites and this means thousands of spinning disk drives and shooting out 11 petabytes of bandwidth a month (that's a real number) and an average of 3-5mil visitors daily. So a good amount of effort is spent just trying to ensure no meltdowns while surviving on a budget of $14m/year. And that $14m budget is EVERYTHING; hardware, salaries, supplies, etc.