Backup Gmail and missing emails

Hi everyone!

I'm looking for quite several days to backup my messages at Gmail. But, although I think have configured correctly the setting, many of the e-mails doesn't appear in the simulation window.

I have done the steps listed http://support.2brightsparks.com/knowledgebase/articles/215295-backup-or-sync-my-files-using-gmail-yahoo?action=kb&article=384, but does not work for me.

Any help please? I have Pro v7

Thanks