Basically the title. The fact that we can read an encyclopedia entry on the economic history of the Netherlands from our phone is crazy. Scrolling over to a random island in the middle of the Atlantic to experience a virtual street tour is insane. There are even websites that let you see live security camera footage (shoutout to EarthCamTV). We have so much information that we take for granted.
It depends.
https://en.m.wikipedia.org/wiki/Wikipedia:Database_download
From 19GB to multiple terabytes.