Add note about triggering backup before stopping

src/views/app.html

@@ -1048,7 +1048,9 @@
         <div class="row">
           <div class="col-md-12">
             <label class="control-label">Start / Stop</label>
-            <p>Apps can be stopped to conserve server resources. They will continue to be backed up but won't be updated.</p>
+            <p>Apps can be stopped to conserve server resources. Future app backups will not include any app changes between now and the most recent app backup.
+              For this reason, it is recommended to trigger a backup before stopping the app.
+            </p>
             <button class="btn btn-primary pull-right" ng-class="{ 'btn-danger': !console.startButton }" ng-click="console.toggleRunState()" ng-disabled="app.taskId || app.error || console.busyRunState" tooltip-enable="app.error || app.taskId" uib-tooltip="{{ app.error ? 'App is in error state' : 'App is busy' }}">
               <i ng-show="app.installationState === 'pending_start' || app.installationState === 'pending_stop'" class="fa fa-circle-notch fa-spin"></i>
               {{ console.startButton ? 'Start App' : 'Stop App' }}