How to delete data from IP Groups for perticular Period

How to delete data from IP Groups for perticular Period

Dear All,

We have installed Netflow Ananyser 7.5

i have 400+ IP Groups configured on teh server , and within month HDD 350 GB is about to FULL  

can any one suggest how to delete data from IPGroups configured for specified time ??

                New to ADSelfService Plus?