To select Gmail mailboxes you wish to backup

1. Click G Suite.
2. If multiple G Suite organizations were added to the backup service, select the organization whose users' data you want to back up. Otherwise, skip this step.
3. Do one of the following:
1. To back up the mailboxes of all users (including mailboxes that will be created in the future), expand the Users node, select All users, and then click Group backup.
   
2. To back up individual user mailboxes, expand the Users node, select All users, select the users whose mailboxes you want to back up, and then click Backup.
   
4. On the backup plan panel:
   
1. Ensure that the Gmail item is selected in What to back up.
2. If you want to back up calendars that are shared with the selected users, enable the Include shared calendars switch.
3. Decide whether you need full-text search (p. 156) through the backed-up email messages. To access this option, click the gear icon > Backup options > Full-text search.