linux system backup

#!/bin/bash
mkfs.ext4 /dev/sda1
mount /dev/sda1 /mnt/backup
#rsync -aAXvHS --numeric-ids --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found"} / /mnt/backup/
tar -czvf /mnt/backup/back`date +%Y-%m-%d`.tar.gz / --exclude=/dev --exclude=/proc --exclude=/sys --exclude=/tmp --exclude=/run --exclude=/mnt --exclude=/media --exclude=/lost+found
umount /mnt/backup