#!/bin/bash

# Variables
MAIL_ROOT="/var/mail"
BACKUP_ROOT_MAIL="/backup/mail"
BACKUP_MAIL_RETENTION=31

# Starting mail backup
echo "Starting mail backup process ..."

# Create directories if not exists
mkdir -p ${BACKUP_ROOT_MAIL}
HOUR=`date +%Y%m%d%H%M`

# Create archive
for domain in `ls ${MAIL_ROOT}`;
do
	mkdir -p ${BACKUP_ROOT_MAIL}/${domain}
	for account in `ls ${MAIL_ROOT}/${domain}`;
	do
    	tar czf ${BACKUP_ROOT_MAIL}/${domain}/${account}\_${HOUR}.tar.gz ${MAIL_ROOT}/${domain}/${account}
	done
done

# Purge old backup
echo "Starting mail purge process for backup older than ${BACKUP_MAIL_RETENTION} ..."
find ${BACKUP_ROOT_MAIL} -type f -mtime +${BACKUP_MAIL_RETENTION} -exec rm -f {} \;