You can have updated report results delivered to you on a schedule by using recurring reports.
After you've saved your report and gotten results, you can set up recurring reports in the "Recurring Reports" tab on the report's manage page.
To set up a recurring report, set the interval you'd like the report to recur (daily, weekly, or monthly), an optional start date for the recurring reports (ex: set the first of the month if you want monthly reports to start on the 1st), end date after which you'll no longer be sent reports, and the email addresses you'd like to receive a notification when the report runs. Click "Save" to save your options.
When the report is set to recur, the targeting will re-calculate and an email will be sent to people set up to receive the notification, telling them of the new count and giving them a link to download report results.
To stop the report from recurring, remove the email addresses or the interval from the "Recurring Reports" tab and save.
In this tab, you also have the option to enable recurring mass operations. You'll be able to automatically add or remove tags from new activists in the report when it recurs.
Note: Activists targeted by the report before the recurring run (ie: activists currently targeted by the report right now) will not have mass operations run on them. Only newly targeted activists will have mass operations run on them. To run mass operations on existing activists, use the "Mass Operations" tab. Mass operations will also not run when the report is manually targeted, only during the automatic recurring report run.