You should be able to do that. In fact, it would make sense to do that since you would want the most recent data possible to be restored. Check out the DiRT help file here:
http://www.ciscounitytools.com/Applications/Unity/DIRT/Help/index.html
If you are not familiar with the in's and outs of the tool, I'd be sure to read up and make sure you understand the supported scenarios.
Hailey
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