Business Data?

I'm not using it, but I assume it's hosted in the US.

Not sure how sensitive you consider your data, however bare in mind that if it is hosted in the US, all your shit is subject to the Patriot Act, which essentially means they can take a look whenever and however they want without your permission.

Sounds like it might be a non-issue for you, but a lot of large Aus based organisations only use internal cloud based on this fact alone.

How do you intend to get 5Tb into it?, just trickle it in?