Maybe people haven't thought of this, but for about $128 a year, you can get 2 terabytes of space on Dropbox. (There are other services that do the same thing.) You can install their app on your computer, and it will automatically sync your files.
So, you can have a complete automatic backup of your hard drive for about $10 a month. If you use a MAC, Apple does it for 99 cents a month.