The LaCie Cloubox is effectively a hard drive. It stores up to 100GB of data and connects to your computer by Ethernet only; no wireless connectivity. What makes it unique is that it automatically syncs the stored data to a remote server, otherwise known as the cloud. Any data passed through the Internet is 128-bit AES data encrypted and up to 10 versions of your files can be stored.
The data can be accessed by any computer with an Internet connection and the correct login credentials. The included software allows you to choose which files you'd like to back up to the cloud, meaning that only the most important documents, movies and so forth should probably be chosen for the sake of upload bandwidth and processing. However, what makes the LaCie Cloudbox useful is that you don't have to leave your computer on and running to back up your data to the online service.