Put it in a file, then run a cron on it:

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import os
import time
from subprocess import Popen, PIPE
import glob

BACKUP_DIR = '/path/to/some/backup/directory/'
LOG_FILE = '{}backup.log'.format(BACKUP_DIR)
USER = 'username'
DATABASES = ['foo', 'bar']

def dump(db_name):
    dump_dir = BACKUP_DIR + db_name + '/'
    # check if dump_dir exists, create it if not
    dump_dir_glob = glob.glob(dump_dir)
    if len(dump_dir_glob) == 0:
        os.mkdir(dump_dir)
    # dump db
    now = int(time.time() * 1000000)
    dump_file_path = '{}{}_{}.dump'.format(dump_dir, db_name, now)
    with open(dump_file_path, 'wb') as dump_file, \
            open(LOG_FILE, 'a') as log_file:
        process = Popen(['pg_dump', '-Fc', db_name, '-U', USER], stdout=dump_file, stderr=log_file)

def clean(days=2, hours=0, minutes=0, seconds=0):
    interval = seconds + minutes*60 + hours*60*60 + days*24*60*60
    x_days_ago = time.time() - interval
    unlinked = 0
    for db_name in DATABASES:
        glob_list = glob.glob('{}{}/*'.format(BACKUP_DIR, db_name))
        for filename in glob_list:
            file_info = os.stat(filename)
            if file_info.st_ctime < x_days_ago:
                os.unlink(filename)
                unlinked += 1
    return unlinked

def log(string):
    now = time.strftime('%d-%m-%Y_%H:%M:%S')
    string = '{} >> {}\n'.format(now, string)
    with open(LOG_FILE, 'a') as f:
        f.write(string)

def start():
    unlinked = clean(days=40)
    for db in DATABASES:
        dump(db)
    log('done | {} old archive(s) deleted | {} new archive(s) created'.format(unlinked, len(DATABASES)))

start()

After backup ,What is the restore command?