Yes, you can make the DMG of the master by putting it in Target disk mode, as long as you have a space that's sufficiently large to store the image. Note that, as explained on p21 of the User's Guide, you'll need to have approximately 2x the size of the data being backed up free to create a DMG.
(Note, also, that I wouldn't use any compression on the DMG.)
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--Dave Nanian
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