title: In django, use django-dbbackup and django-crontab to backup automatically
body: <p>I'm use django-bdbackup and django-storage backup my db into aws s3, fortunately it work.</p>
  <p>In the next step, I want to it backup automatically, but it's not lucky this time.</p>
  <p>I add two things in SETTINGS:</p>
  <pre><code>INSTALLED_APPS = [
  ...
  ...
  ...
  'django_crontab',
  ...
  ...
  ...
  ]
  </code></pre>
  <p>and</p>
  <pre><code>CRONJOBS = [
  ('*/1 * * * *', 'django.core.management.call_command', ['dbbackup'],{'-o':'2020-07/dbbackup_20200801.7z'})
  ]
  </code></pre>
  <p>It's not work.There are nothing in my s3 bucket, and no message appeared.</p>
  <p>Can anyone tell me what I wrong or something I miss?</p>