The 4.12 Default Domain for an incremental backup includes the SYSTEMOBJECTS
domain.  This includes your registry, event logs, system files plus other
objects.

When you are doing a scheduled backup it is also backing up the
SYSTEMOBJECTS.  From the GUI I assume you were not selecting the "SYSTEM
OBJECT".

If you don't want to include the SYSTEMOJBECTS as part of your scheduled
backups, you can change the DOMAIN statment in dsm.opt to only include the
drives you want backed up:
Eg. DOMAIN C: D:

If you do this, ensure you understand that you are not backing up files like
the registry, event logs, NT System Files etc.

Tim Rushforth
City of Winnipeg