For Seeding, the following permissions are needed for the Authenticated User (in addition to the permissions required for Backup Authenticated User):
System Permissions
*Enable in ‘User Interface’ in setup if not available
For more information on using the Salesforce Integration User License (API Only) as your Authenticated User in our application, see here.
For information on user profile permissions for an Authenticated User for Backup & Restore, see here.
For information on user profile permissions for an Authenticated User for Archive, see here.
For more information on user profile permissions in Salesforce, see here.