Logging the debug output

Hi all I have an ongoing issue with a FreeRADIUS third-party module that is very intermittent (only shows up at a random time each day). In the past, running FreeRADIUS in debug mode has been very helpful, but I don't like leaving it running from a command line indefinitely. Is there a config setting that allows me to log the same output that that the debug mode produces to a file that I can then go through at a later stage? I realise this will impact performance and consume space... Thanks Brett.