http://lifehacker.com/5048398/dropbox-for-linux-adds-online-backup-to-home-folder
Dropbox, the free, web-based backup service previously available only
for Windows and Mac computers, has added a free, open-source client
for Linux to its offerings. Installing Dropbox puts a folder named
"Dropbox" in your Home directory (which can be moved or renamed), and
anything dropped in that folder gets backed up to your Dropbox
account. The service also adds a control widget to your system panel,
letting you see what's in your 2GB of free space and control bandwidth
usage. Dropbox is still technically a closed beta, but installing the
Linux client let me set up a new account without any invite. Dropbox
is a free download for Linux systems.
Dropbox