I use Macrium Reflect Free. It's good and free. I started using it last 2 years and it gave me good service. But the limit is that it will only do full image back-ups. The Macrium Reflect Pro gives you file and folder back-ups etc. You will also use Bart-PE since it will require you to make a boot cd.
Another is software freeware is DiscWizard powered by Acronis. If you have a Seagate installed HDD in the pc it will run. You can download it at the Seagate website for free. DiscWizard is a downgrade of Acronis True Image 11. It is much the same as Macrium Reflect free but the one thing I have noticed between the two is that DiscWizard backs up with more less size than Macrium. DiscWizards boot cd is included in the program so you dont need to have Bart-PE on it. You can create the boot cd on it's own. Again, DiscWizard will only run if you have a Seagate hdd installed.
Hope this can help you