All data exchanged between Salesforce Marketing Cloud and Jacquard via the classic test and send integration is operational. No data related to individual subscribers or any other personal data is returned to Jacquard.
All subscriber audience processing is handled from within your Salesforce instance using SFMC functionality.
The Jacquard integration retrieves the following aggregate-level metrics:
Number of delivered emails per language variant
Number of opens/open rate
Number of clicks/click rate