Site Statistics for iControlWP are stored on your site.
Note: This option/feature is no longer applicable to the latest version of the Shield Security plugin and is here for reference purposes only.
When you load the statistics tab for each site iControlWP will pull in your statistics data from your site in real-time and display it.
Since site statistics are primarily an indication they do not store large amounts of data. It will only store the daily statistical data for the previous 30 days and for more historical data, it will remain monthly visitor statistics.