BackupBuddy by iThemes is a wonderfully simple solution for WordPress backup and migration. That is, when it works. On a hunch I decided to check my website backups and discovered that while database backups were fine BackupBuddy was failing to create full website backups. Even worse, emails that were supposed to notify me of the errors were not being delivered.
Yeah, that’s not good.
Now before you jump the gun and completely write-off iThemes, the TL;DR of this post is that there was nothing wrong with BackupBuddy; Acunetix WP Security had added an unreadable file to prevent directory listing. After adjusting some settings I got everything to work again.