record everything in OBS except ONE source

I want to stream everything that is visible in OBS so just like normal but want to record everything except my webcam.
whats the best way to do this?

do I really have to use something like source record to capture everything seperatly and edit it back together?
cause I really dont want to encode a 4 hour-ish video again

is it a good idea to run two instances of OBS, one is streaming a scene with the webcam and the other instance is recording a different one without the webcam?
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