alt Hacker NewsThe Branchoutput plugin[1] is what you are looking for for multi recording/streaming. It allows you to add recording (or streaming destinations) to individual sources, scenes and outputs via the video filter settings. It is really quite powerful.
[1] https://obsproject.com/forum/resources/branch-output-streami...
Thanks -- this does look like it would do this. But I'm wondering if this entire setup isn't completely overkill. All I need is to record multiple video streams simultaneously. I currently do this by launching multiple Quicktime Player apps and clicking "record" in each one of them...