1.8 zettabyte of data has been produced world wide in 2012, according to bild der wissenschaft plus "Auf in die Zukunft".
That’s a lot. That’s 1.8 times 10 million petabyte. 1 petabyte is 1000 terabyte. 1 terabyte 1000 gigabyte.
1.8 zettabyte is ~ 200 × estimated information content of all human knowledge (as of mid-1999), according to Wolfram Alpha.
And here is another interesting figure from this magazine: there are 18 victims of cyber crime every second, 1.5 million daily, according to Symantec’s Cybercrime Report.
Welcome to the era of "Big Data" !