Backing up on Windows 8

Hey,

I have just gotten a mac book air, and my wife has just got an ASUS Zenbook. I have done the configeration for my Time Capsule and and bridged it with my Easybox 803. It seems to have backed up my Mac just fine.

I have downloaded the Airport Utility for my wifes Zenbook and run through the whole install process and she can connect to it the TC just fine. But because there is no Time Machine program on her laptop i cant get it to back up to the TC like my Macbook Air does.

Am i doing something wrong or am I an idiot.

In my defence i am try to learn both OS X and Windows 8 and im pulling my hair out (wish she'd bought a Macbook to)