Welcome to the forums bdresch
Instead of spending $100 on the upgrade to Windows 7 Pro, why not spend that on getting some really good backup software instead? The Windows Backup does a decent job for a built-in solution, but it's nowhere near as flexible as a 3rd party option like Acronis. There are even some free solutions which may do what you are after.
If you let us know the requirements for your backup software and we may be able to point you in the right direction. For example, do you need full image backups, incremental backups, etc...
Here's the Acronis website for you to have a browse of :
http://www.acronis.com/homecomputing/