I assume the ARQ Cron FailSafe Shutdown is for the wp-content folder correct?
If so, you website is missing the standard WordPress /wp-content/index.php file, which BPS Pro is looking for.
Create a text file with Notepad, add the code shown below and save it with this name: index.txt
<?php
// Silence is golden.
Turn Off AutoRestore.
Upload the index.txt file to your /wp-contents folder and rename it to index.php.
Click the AutoRestore wp-contents Backup Files button for the wp-content folder.
The ARQ Cron FailSafe alert should go away.