EXTREMELY IMPORTANT: Please attach a ZIP file containing your Akeeba Backup log file in order for us to help you with any backup or restoration issue. If the file is over 10MiB, please upload it on your server and post a link to it.
I am testing J 5 on my localhost and when I want to display the list of backups, I get that error "500 Class "JText" not found".
The file is
\administrator\components\com_akeebabackup\tmpl\manage\default.php Line 122