Hi Neal
If you need software to take and image of your drive, so you can load it on a new disk, GHOST is really good.
If you want a free piece of software to backup folders and files I recommend Robocopy. It will syncronise and is fast. I use it to keep backup of app 150Gb of data to a network disk.
Bad things: You have to run a script with options to backup (unless you can get Windows to schedule a script?)
http://en.wikipedia.org/wiki/Robocopy