When a Campaign is sent from Campaign Monitor tracking data is collected from recipient interactions. Every hour (by default this can be changed) Campaign Monitor for Salesforce will pull these records into Salesforce via a batch process. We do this to be as efficient as possible. Once the records are created we attempt to match them to a Salesforce Contact or Lead record based on email address. If an email address cannot be found the record will remain orphaned until a match can be found.
Each tracking statistic record will show you (amongst other things) the campaign name, activity date, and the type. The types of tracking data we store are sent, open, clicked, bounced and unsubscribed. Email tracking statistics records are visible via:
By clicking on a Subscriber member record and navigating to email history
Salesforce reporting and dashboards
Finally, it is worth noting that email tracking statistic records take up space and count against your overall Salesforce storage limit. So to help we have two easy ways to tune storage, you can learn more here.