Megabytes, gigabytes, exabytes. This article places total global data capacity at 276 exabytes in 2007 (so we know it's already a stale statistic).
Of course, it goes on to provide you an illustration of how much data this encompasses (e.g. "If I poured pancake syrup on top of Donald Trump's humongous ego, it would take four gazillion years for it to drip down to the plate."), but I prefer this example:
My dictionary gave me an error…it doesn't recognize the word 'exabyte'…which is also why predictive coding is the new, new thing.