"Big Data" is a big trending term on the internet (especially on the web sites of big companies selling data management services). For example, I came across this article while reading the Irish Times in an airport. It contained this recent claim from IBM which has been frequently repeated elsewhere (my emphasis):
Every day, we create 2.5 quintillion bytes of data — so much that 90% of the data in the world today has been created in the last two years alone.
Is this just marketing hype or is the claim credible?
NB it might also be worth asking whether the claim holds up with something other than a vague definition of "data".