Gmail give its user a large amount of diskspace, we can make use of it as our online backup storage space.
Gspace is an Firefox extension that let us backup our files to gmail account easily.
Gspace support for Windows, Mac Os and Linux.
To install Gspace, you will need to have firefox browser installed in your computer.
To install just go to the download page, and select your platform.
To use Gspace, of course you need to have a Gmail account.