경로 수정

templates/preview.html

@@ -54,7 +54,7 @@
     <form method="post" action="/apply/{{ job_id }}/backup">
       <button class="btn" type="submit">Rollback from Backup</button>
     </form>
-    <button onclick="history.back()">Back</button>
+    <button href="/">Back</button>
   </div>
 </div>
 </body>