I installed this plugin yesterday after updating to Wordpress 4.1 and and ran one backup. Today the website is still live, but when I try to access the admin page it says 500 internal server error. The language for this site is set to French, so this is the exact error message I get:
Error 500 - Internal server error
Un problème inattendu est survenu.
Veuillez réessayer ultérieurement.
Translation: An unexpected problem occurred.
Please try again later .