They give me half of a 2TB drive? Doesn't that mean that I'm getting only one copy of my data stored outside my house? So if a power surge fries my equipment, there's one copy of my data spread across a couple dozen other machines. I guess that's fine as long as no one but me experiences any failures...
It's possible that they're just overselling, and they expect most people to use only a couple hundred megs, which would allow lots of redundancy. If so, that seems like a really bad idea, since heavy usage of an on-site disk is likely (let's back up all these pirated movies!), and their buildout requires either signing up new customers or swapping devices, neither of which is quick or cheap.