sing the
        <a class="xref" href="envset_backup_config.html" title="DB_ENV-&gt;set_backup_config()">DB_ENV-&gt;set_backup_config()</a> method.
    </p>
      <p>
         The <code class="methodname">DB_ENV-&gt;backup()</code> method may only be
         called after the environment handle has been opened.
    </p>
      <p>
         The <code class="methodname">DB_ENV-&gt;backup()</code> <span>
            <span>
                  method returns a non-zero error value on failure and 0 on success.
    