From Twocanoes Software:
If you want to make a quick clone of your bootcamp partition, or you want to migrate your bootcamp partition to a different machine, Winclone makes it a breeze. Winclone will create an image of your Windows partition, and allow you to quickly restore it to get you back up and running quickly.
What's new in this version:
Incorporated "disk already not mounted" changes from
roaringapps comments. Added additional documentation on restores in
readme file (i.e. about not installing Windows after Boot Camp Assistant
completes the repartition).