I haven't had this issue yet but is it also a problem with the 'create system image' portion of Windows Backup? The reason I ask is that I did one full backup creating a sys image as well as the full back up and it took a ridiculous amount of time though it did work.
Instead, I sync my data folders once a week and kept the system image from my clean install + software I knew I wanted and all the windows updates and created a sys repair disc. It's like havin a double backup of your data and with a repair disc, a very easy to re-install,pre-configure/customized to your liking OS. If any other major updates come out-like the one that corrected usb drivers for nvidia mobos, i sync them in with the data and I can be up and running again quickly without even having to connect to the internet.
The app whs mentions accomplishes the same thing with system images. Syncing what's really important-data-once a week and having a custom sys image is the best backup strategy I've found yet. And it saves tons of time too.