How much data is created daily (source of IBM estimation)

Question

I've stumbled upon this IBM text.

It states that:

Every day, we create 2.5 quintillion bytes of data

It's very interesting statistic, but I couldn't find any source for this.

Does anyone know how they calculated this? Or maybe someone knows some papers showing similar/different results?

This paper from CSA has the same statistic, but again without any source.

Note: The quote from IBM's text refers to data created by humanity, not by IBM alone.

Answer 1

The McKinsey Global Institute published an interesting report on the topic of Big Data. You can find it here.

I don’t know where IBM go the numbers from, but this report is a good source.