Shadow Protect Desktop is a great price and is amazingly fast!
The software is also rock solid stable.
Being a designer and animator I have huge amounts of data, 500 Gigs at last count.
SP backs it all up fully in about 3 hours and does incremental backups in about 5 minutes.
The software creates an image of the hard drive you are backing up. What this means is if your drive crashes you can reload all of the files onto a brand new hard drive, including operating systems and programs. The down side is you cannot select individual files and folders, you have to backup the entire hard drive. This is actually a good thing and to restore any file you CAN restore only 1 file or folder.