Another Google tool where you may be exposing your data across the internet, and have no control over where/how it's stored:

http://www.guardian.co.uk/technology/2009/jan/25/google-drive-gdrive-internet

How are they storing your data? Will it be encrypted? Doubtful, as this will slow down performance.

You're handing over your personal data to another company. In another country.

It was tried ten years ago, and never took off.

The private sector are the biggest users of PCs. Business will not use this, as they have to meet their legal and compliance responsibilities. That's why it ain't gonna fly.

Rant over.