Backing MailData

How can I backup all the emails (email users/mailboxes/ditrectories/mailserver setting everything related to email) ?

I use to save the mailboxes in the users home dir. The sendmail conf file is at /etc folder. So is so if I bacup the home dirs and /etc folder do I need more to restore the emails in another email server running same smtp (here sendmail)?

 

 

 

 

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