Snapshot reports can be created as an event on a campaign.
When adding an event to a campaign, you will be asked whether you would like that to be an e-mail event, or a snapshot creation event.
You can also add Snapshot creation as an event on an existing campaign. If you had previously generated a report for a particular business more than 30 days prior, the Snapshot Report will be refreshed.
Once you've started your campaign, you will be able to view statistics on the emails you have sent out, on the campaign event.
You should note that the Snapshot Creation event does not send out the report, but generates one. In order to send out the report you would need to add an email event to follow the report's creation.