I still see people every week loosing important data, ranging from crucial word documents to personal emails, photos and music, there is now many on-line backup services, that allow you to install a simple piece of software on your machine and backup your files to the internet, it is not really suited for large business backups, but perfect for home users to quickly setup, my favourite is SugarSync it gives you 5gb of free online storage and is simple to use.
Follow the link above, sign up now and start backing up your data!