When you view some report on the View tab of the Report properties dialog, you can save it into the report history using the Save button. You can view the saved reports on the Saved reports tab. When the data changes, the saved reports are not affected.
Click the Save button on the View tab. Now switch to the Saved reports tab. Here you can see a list of saved reports, it should look something like this:
Concluded in the example section of the Displaying a report on a web site topic.
Page url: http://devnet.kentico.com/docs/5_5r2/devguide/index.html?saving_report.htm