If "clone" means "copy", then yes, Casper clones C to E. The clone can be viewed and opened with Explorer. Every file can be opened directly.
In my interpretation, you need software to both create an backup image and later to retrieve it.
In that regard, Casper does not create an image.
I have used Acronis true image and removed it for that reason. To me, an image is not a good backup. IMHO, of course.
I also have tried Partition Magic backup, Windows 7 backup, and Nortons Security Suite backup, and deleted them for the same reason.
They create images that cannot be used until you run some kind of recovery program.
To me, having to run another program to utilize your backup or even test your backup deteriorates the value of your backup method.