Ovewrite existing computer backup in norton ghost 15

Other Norton Products/Services
1

Everytime i use windows  and i do a new system image its ovewrite the old one,that way i always have just one backup.

So I want the same thing with norton ghost 15.

 

What exactly i mean is,everytime a create/define a new computer backup i want to ovewrite the old backup,that way i always have just one backup.

 

Is that possible and how?

 

Thanks guys!