DPM recover system drive disk space

How to recover space on your SCCM DPM 2012 server system C drive.

Open file explorer and browse to
C:\Program Files\Microsoft System Center 2012 R2\DPM\DPM\Temp
Here you might see many .errlog files.

You can safely delete these .errlog files but first you need to investigate the most recent ones and take the appropriate actions.  If you need to recover space immediately then copy the most recent few logs to an alternate location and then you delete all of them on the DPM server.