When you can buy a 500 GB drive for $119 (regular is $164) it's time to backup your PC. http://allwaysync.com/ is the most recommended. It synchronizes your PC to your 500 GB drive ensuring both are the same, should your PC fail, a full, up to date copy of the files are on the USB drive. I am testing this out today. It works.
WARNING: to create a complete and perfect copy of a drive:
- Make sure you set the properties for all jobs to FILTER - HIDDEN ANY otherwise, it will exclude hidden files from the copy.
- Make sure you copy in one direction and allow deletion.