"Automated backup status" emails - How to enable?

by Acqua Alta.  

Hi,
There are the "Automated backup status" report e-mails that are being sent to the administrator(s).
For example:

Summary

==================================================
  Courses; 4
  OK; 3
  Skipped; 1
  Error; 0
  Unfinished; 0
  Warning; 0
  Automated backup pending; 0

  Backup completed successfully

Lately I noticed that I don't get them from a Moodle server. Which settings do I need to enable in order to get these e-mails after each automated backup?

Thanks in advance