Loaning QC to friend to try it out...question re: Cloud, backup, etc

I have a friend who wants to try it out. I figured I could back up mine in its current state and that way he could do whatever he wanted to explore it properly and I would just restore my backup when it is returned.

Can he create a Cloud account and use it as if it was his, as if he bought it used, even reset it to factory defaults etc, and then I restore it to my account when it returns?

Are there any problems with doing that?