I strongly recommend you try Dmailer Backup which is now free, im not sure if you prefer local backup or online but this application does both running from a portable hard drive or usb key.
Let me know how you go.
Also, i disagree with using an image for a backup but rather to backup just your most important files. Nowadays There are so many files on a disk you dont need such as windows & program files. If you need to format a fresh install will run better than an old well used image. And its much easier to upgrade your Operating System too.
Im not saying this for all case but just some points to consider.