Google Apps Admin Forward Email. This feature can be managed from the google admin console. So even if a user deletes his/her email or a file in google drive, you can login to google vault as an admin and search for users emails.
Centralized administration makes setup and management fast and easy. To forward a user's email to a g suite address, have the user set up a forwarding address from their gmail account. To configure this, a g suite administrator can go to the admin console > apps > g suite > gmail > user settings > automatic forwarding> and uncheck allow users to forward incoming email to.
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If sending from google servers and having an archive of your sent emails is a must for your team, you'll need a full g suite user email inbox set to. Protect your organization with security analytics and best practice recommendations within the security center. In the email address field, enter your name and alternate email address. Creating and verifying forwarding addresses