Richard, Linux has builtin backup utilities such as tar and cpio. You don't need RAID to backup your main hard drive, you can use a second internal hd or a usb external one and set up your crontab to copy the entire disk via cpio nightly or so. That is the method used at some major data centers. Personally I just back up the data to flash drives and external hd myself. I have been using Linux for over a decade and had a major hard drive crash only once.
Last edited by decemberflower; 20th February 2008 at 05:32.