I have a customer that wants to migrate to my server. They have 7.5GB of junk that is broadly "website" and 2.5GB of emails. They are willing to ditch the site that were were going ho have replaced anyway so I think a fresh start is best with just the emails. How do i do this? do I run an "email backup" in cpanel that i am aware will only save settings and redirects and then download and re-upload the "mail" folder?