MISHA Got it, that makes more sense.
But that's also the way this sort of software works. There's no magic bullet to protect/recover data. I imagine the 5GB TechTool is using in your case is a lot less space than it would take to create full backups of all your drives, no?
Having said that, you can just disable those features of the app. There's still lots of other good tools for performing preventive maintenance and repairs (and you don't even to install it on your drive, you can just boot from DVD when you want to run those).
(Version 5.0.4)