Provide exclusion rules for file directories when scheduling tasks to back up sites and directories

BTPanel/templates/default/crontab.html

@@ -122,6 +122,7 @@
                 <ul class="help-info-text c7 ptb15 mlr20">
                     <li>{{data['lan']['PS1']}}</li>
                     <li>{{data['lan']['PS2']}}</li>
+                    <li>{{data['lan']['PS3']}}</li>
                 </ul>
             </div>
             <form id="set-Config" action="/crontab?action=AddCrontab" enctype="multipart/form-data" method="post" style="display: none;">