How to backup conf and mails?

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Linux/BSD distribution name and version: Debian
- Related log if you're reporting an issue:
====

Please share the script for backup config and mails.
How can i import this backup config to a new hardware.?

Regards,