To disable the “System Logout Backup Reminder”, please do the followings:

Logon to OBM

Select the backup set that you want to disable the Logout reminder from the left panel

Select the [Extra Backup] node under the backup set node on the left panel

Uncheck the [Enable System Logout Backup Reminder] checkbox under the “System Logout Backup Reminder (Windows)” section

If you want to do this to all backup sets, please repeat the previous step for each backup set
Press the [Save Setting] button from the toolbar