Free up disk space on Netflow Analyzer

Free up disk space on Netflow Analyzer

Hi All,
 
I was wondering if it was possible to prune historical data in Netflow Professional?
 
We had an issue where the server hosting Netflow ran out of space yesterday, I added an extra 5 gig to the drive but today Netflow decided to use up the extra 5 gig.
 
I've read other posts where its possible to set a retain data value by going to 'Product Settings --> Storage Settings' but i'm not seeing Product Settings anywhere in our Netflow.

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