Originally Posted by dereksurfs
I used the free open source Win 32 Disk Imager
utility to install the inital image. But it is designed primarily for writing images to an SD card, not creating them.
I don't know the precise steps for W32DI (I use WinImage, just because it's the one I got to work first), but I'm sure you can use it to make an image of an existing disk--backing up images is, in fact, its primary purpose. Just look through the menus for the option to save or back up a drive.