Not sure if I'm reading you correctly but it sounds like Starise wants to actually replace his C: system drive in which case you would want to CLONE the c: drive. It's been awhile since I last did this but I used the Acronis boot CD to do it. I don't have access to the material right now but, as I remember, that process was under a tools menu or somewhere different from the normal Acronis CD boot-up screen. Best to look up 'clone' drive in the Acronis manual.
I do know that I had to remove my existing C: drive and physically install the NEW C: drive in the same place as the old one. Then I put the original C: drive in another physical slot. From there I had to boot with the Acronis CD and go through the clone process.
Also, even though it was a clone there were a few vendors that had used the system drive to register some of my software and I had to go back and re-auth those software packages. Wasn't a big deal at the time.
Mesh, if you just want to make an image of the C: system drive in order to restore to the same C: drive just as a backup that is pretty easy to do from the Acronis boot CD and if you have any specific questions I would be happy to try and help you out.
If you're wanting to clone another C: drive to put on the shelf I can't help with that as I've not had any luck with that one. Jim R. could provide more help there.