title: systemctl failing with unknown section 'Timer'
body: <p>I have a systemctl job that performs vertica backup to s3, i wanted to add a timer that runs everyday at 3am . I tried to create an override file with the timer section but when i do daemon-reload, I am getting an error `Unknown section Timer', I am unable to find the issue.</p>
  
  <p>/etc/systemd/system/vertica-backup.service.d/Override.conf</p>
  
  <pre><code>[Timer]
  OnCalendar=*-*-* 03:00:00
  Unit=vertica-backup.service
  </code></pre>
  
  <p>/etc/systemd/system/vertica-backup.service:</p>
  
  <pre><code>[Unit]
  Description = Vertica Backup Service
  After = network.target
  
  [Service]
  User= dbadmin
  ExecStart= /usr/local/bin/vertica-backup.sh
  </code></pre>
  
  <p>Error</p>
  
  <pre><code>May 15 15:19:47 ip-10-150-4-42.ec2.internal systemd[1]: [/etc/systemd/system/vertica-backup.service.d/override.conf:1] Unknown section 'Timer'. Ignoring.
  May 15 15:19:50 ip-10-150-4-42.ec2.internal systemd[1]: [/etc/systemd/system/vertica-backup.service.d/override.conf:1] Unknown section 'Timer'. Ignoring.
  </code></pre>