By default the top N record count for aggregated data in NetFlow Analyzer is set as 100. It is possible to change the storage of top N record count from Settings.
Note: The record count can be increased up to 300.
To manage historical data, navigate to Aggregated data under storage settings and select "Retain data".
By default, the aggregated data is retained "Forever" in NetFlow Analyzer. You can change it to Last month, Last 2 months, Last 3 months, Last 6 months, Last 9 months, Last years and Last 2 years.