It is certainly possible to monitor Microsoft System Center DPM server without leveraging SCOM. You can use Windows Event Viewer to determine whether there are any errors being reported in the System event log that might indicate a problem with your DPM server. You can also use DPM Administrator Console to view the operational status of your DPM server. By further enabling reporting and configuring email notifications, you can view usage and determine any health trends that might be occurring. Finally, you can use Performance Monitor and use standard performance counters to gain insight into the overall performance of your DPM server.