To export data for a large number of users efficiently, follow these steps:
Contact Google Cloud Support: Since your organization has more than 1,000 users, you need to request access to the Data Export tool. This tool is not automatically available for large domains.
Enable the Data Export tool: Google Cloud Support will enable the tool for your organization.
Use the Data Export tool:
Once enabled, sign in to the Google Admin console with super administrator privileges.
Navigate to the Data Export tool under Tools.
Initiate the export process, selecting the data for the 1,200 users.
Manage the exported data: After the export is complete, review the data and remove any unnecessary user data to streamline the results.
Reference:
Google Workspace Admin Help - Data Export
Google Workspace Admin Help - Contact support