title: Override file while backup database
body: <p>I want to back up a database using this code</p>
  
  <pre><code>sqlcmd -S servername -Q "BACKUP DATABASE [DBName] TO DISK = 'C:\backup.bak'"
  </code></pre>
  
  <p>It works. But if the backup file already exists, the data gets appended to the file instead of replacing the file. Every time I call <code>BACKUP DATABASE</code> the file gets bigger.</p>
  
  <p>Is there an option for <code>BACKUP DATABASE</code> to force a replace?</p>