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Badlydrawnboy.
The last first. SD & CCC do incremental type back up functions. DU can not.
From DU Help:
Duplicating a disk
You can duplicate one hard disk or volume onto another. For example, you can duplicate a disk that contains photos and movies to send to a friend, or you can duplicate your startup volume to use as a backup.
To duplicate a disk:
Click the disk or volume you want to duplicate and click the Restore tab.
Drag the disk or volume you want to copy to the Source field.
You can drag it from the list at the left or from the Finder.
Drag the disk or volume that will contain the copy to the Destination field.
If you can’t drag a particular disk or volume to that field, you can’t copy to it. If it’s your startup disk or volume, start up your computer with another disk, such as your Mac OS X install disk. Otherwise, try to quit any applications that are on it or that use documents on that disk.
If you want to erase the destination before copying to it, select “Erase destination.” If you want to use the copy as a startup disk, select “Erase destination.”
If you want to add the original’s contents to the destination without erasing it, deselect “Erase destination.”
Click the Restore button.
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