Despite the name, the LaCie Cloudbox has nothing to do with Apple's iCloud.
The LaCie Cloudbox is a hard drive that does more than expected. To get the basics out of the way, it's a data storage device that holds 100GB memory. Here's where you see the beauty of this item: once you store your files, those same files are then sent off to a secure server called the Cloud. This means you have a physical backup and an online one, should something happen to your device. So suppose your hard drive got fried, you can still go on the Web to retrieve your data. The server is completely protected with a password and a 128-bit AES encryption that even LaCie supposedly can't circumvent, according to Gizmag.
The LaCie Cloudbox will be available for both PC and Macs.