[Udpcast] faster image

Is there a switch command that will enable udpcast to only image the HD that has information on it? For ex. If a HD only has 6 of the 40 Gig taken on it, Ghost will only copy 6G. I love the udpcast software, but it takes longer because it copies the whole 40G HD. Is there a switch that will fix this? And where do I need to put the command? Thanks. Michael Sugg AV/Computer Tech Randolph County Schools 2234D Enterprise St. Asheboro NC 27205 (w)336-318-6170 (c)336-736-7538