Gone are the days that the personal computer (PC) are personal.
These days, the computer is just an interface to the web. And with the rising popularity of smartphone and tablets, the laptop becomes almost redundant, relatively speaking.
And since almost every one owns more than one computing device, it makes sense not to store everything on one device.
Moreover, storing important files and documents or precious videos and music on a single computer is like putting all the eggs in one basket. That becomes a hassle when these files need to be updated and synchronized across all the different folders on all devices.