Cron job

sudo crontab -e


# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of week (0 - 6) (Sunday to Saturday; 7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# │ │ │ │ │
# * * * * * command_to_execute

0 0 * * * /opt/odoo12/run_backup.sh