Backing up your precious data to protect your files is essential; the Seagate range of hard drives provide a reliable solution for backing up your data or a large capacity hard drive for installing Linux to. I remember I installed Mandrake Linux once onto a 80 Gigabyte hard disk and due to the large capacity it prompted me to copy all of the packages from the DVD to the hard disk and if I needed to install any more packages I could install them from the repository on the hard drive. Nowadays everything is installed from the Internet and you do not need to install many packages from the hard drive; but a large capacity hard drive is still a good addition to your computer system in the modern age of larger and larger files and the fact that movie rentals have moved online allowing the download of rental movies to your hard drive. This fast and high capacity 3 Terabyte hard drive in an external housing will be a good solution for backing up your movies and music as well as backups of your critical work files. Coupled with an eSATA capable external hard drive housing; you will be able to copy large files at a high transfer speed. This Thermaltake example is a worthwhile hard disk housing that will keep your hard disk in good health.
Linux provides the rsync command that can be scripted to backup your Linux machine. There is a nice guide here: http://www.mikerubel.org/computers/rsync_snapshots/ that will teach you how to use the rsync command to backup your precious files. Here is a good collection of rsync scripts that may be automated with cron to backup your Linux system. That is why Linux is such a good desktop operating system; the flexibility offered by the many scripting languages built into the many Linux distributions allow easy systems administration of your desktop or server.