Reports only show detailed data for 24 hours, the rest of the information is only an average of the hour. 

Is there any setting to retain the detailed data or a location store on the local disk I can run a daily copy from?

Thanks for your time.

You can save more of the detailed data within WhatUp by changing the Performance Monitor rollup times.  You can find these settings in Program Options under the Configure drop down menu; click on the Report Data tab.  Use caution when increasing the amount a raw data stored within the database.  Going past the limit of the database size can have you running for a backup copy.  You do backup the database, right?

The second option that comes to mind is to setup Recurring Reports.  Have the program send you an email with the charts you later want to reference in the long run.