Hi Mr Grim,
Can't see a way round that as it's a complete pc backup, and the 7 boot files are on the System partition, it wants to back that up too.
Backup size would be huge, also be interesting to know how long it would take!
3rd party apps. would be better for this - quicker and with compression, plus more flexibility.
I am using the free version of Macrium Reflect - it is unbelievably small and fast, also allows you to schedule and to mount a backup
and also to copy back any files you want - in addition to being able to restore the image.
It does all that for free and you can make a boot disc if you need to boot in to restore an image.
The paid version adds a few extra bells and whistles , but the freebie will be enough for many people. Macrium Reflect Free Edition 4.2 build 2033 - Downloads - ZDNet Australia
Hope you like it