DVD Shrink

This famous software is one of the best ways to "backup" your DVDs. You can have a 6.4GB DVD and shrink it to 4.5GB(standard DVD size) as you create an ISO image on your computer. This is handy when you want to "backup" a dual layer DVD onto a single layer DVD.  The people that produce this free app do not host the application on their website.  But I have listed some official download links below.

Official Website:
http://www.dvdshrink.org/what_en.php

Download Links:
Softpedia Mirror (US)

Softpedia Mirror (RO)