Many use Trunking Recorder to record audio from SDRTrunk. Setup is relatively straightforward.
Recording audio from trunked radio systems monitored by Unitrunker, SDRTrunk, and ProScan
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“Trunking Recorder is a Windows application for recording/importing audio from trunked radio systems monitored by Unitrunker, SDRTrunk or ProScan. Trunking Recorder will save all the recorded calls and allows searching and playback through a web browser. Trunking Recorder will also queue up recorded calls so you never miss any activity when multiple talkgroups are active at the same time”
Trunk Recorder (similar name, but different application) is Linux based.
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trunkrecorder.com
Trunk Recorder is able to record the calls on trunked and conventional radio systems. It uses 1 or more Software Defined Radios (SDRs) to do this.