Detailed Execution Logs not Showing

by Sergio Mazzarelli.  

I use automatic backup. I am trying to investigate a problem and I would like to see the detailed backup execution logs. Online documentation for Moodle says:

A last execution log of scheduled course backups can be found in>Administration> Site administration > Reports > Backups. It displays a list of all course backups made, the time taken to create them, their status (see below), and the next scheduled automated backup execution time.
Clicking on a particular course name will cause a detailed execution log to be displayed, including date, hour and minute when each step of the backup was performed.

Well, in my case the course names in the list are not clickable, so I cannot see the detailed logs. I run Moodle 2.7 on a Debian Apache server.  Has anyone experienced the same issue? 

Thank you.

Sergio Mazzarelli