Enables you to put a backup on hold until all users log off from Windows.
Example
Run the backup at 20:00 every Friday, preferably when all users are logged off. If one of the users is still logged on at 23:00, run the backup anyway.
As a result:
(1) If all users are logged off at 20:00, the backup will start at 20:00.
(2) If the last user logs off between 20:00 and 23:00, the backup will start immediately after the user logs off.
(3) If any user is still logged on at 23:00, the backup will start at 23:00.