I'm not sure from your post whether this is user data or the system image but theres plenty over at Sourceforge and the price is always right :) click here
Although not free for system images I prefer the Paragon tools as they can recover a boot partition from DVD or portable disk but to make this workable you need to keep user data seperate from the system parition.
In Vista I use shadow copy for may main machine data but prefer to run it when convenenient or to schedule rather than as a background task - I would have thought this would suite server operation too-what problems are you getting ?.
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