Dropbox...save files on multiple computers for free

I recently came across a website called dropbox.com. What they do is provide a service that allows you to save a document in your dropbox folder and it will automatically save another copy of the folder’s contents in the dropbox folder on every computer you have dropbox installed on. Dropbox also backs up the items saved in your drop box folder online. The convenience of drop box as opposed to other back up’s like your thumb drive is drop box is automatic. As long as you save it in your drop box folder it is updated on all your other computers. Drop box can even be installed on a variety of different cell phones. Dropbox offers the service for free for up to 2 GB of space if you need more space there is a monthly service charge.