[SOLVED] FullScan

Hi,
I have a question about the fullScan.
What would happendif I run the fullScan twice ?
Let's say I run fullScan on production it completed succesfully, I imported on the new server also succesfully.
New server has now the mailstore of Production from 2 weeks earlier.
Can I run a fullScan again on Production to the Data ferry we used earlier and import this into the new server ?
Would this work or do I need to run Smartscan ?
Thanks,
Perry