I want to change this setting as my backup disk (used by Windows Backup) is nearly full - but this is maintained by Windows Backup and not by me. The Mail every minute is quite annoying. How can I change it and not affect the system drive?

Hello Hufe,Please refer to the article below to find the threshold:Overrides Logical Disk Free Spacehttp://social.technet.microsoft.com/Forums/en/operationsmanagergeneral/thread/4a1da223-3047-480f-9ca7-c4068bba9626Thanks,Yog Li - MSFT