I have OBS set up, and it works pretty well once you figure out the right settings. Since Pegasus Prime runs through ScummVM, you can set it up with OBS game capture and it'll work just fine. Buried in Time and Legacy of Time are different, though, you'll have to use screen capture and set the capture resolution to whatever resolution the games are forced to run at.
Edit: Buried in Time might get easier to record in the future, there are rumors that Presto is going to remaster it at some point.
Presto is defunct, long out of business, right? I really enjoyed these games...if the company had not tied itself so closely to the Mac in the beginning, who knows what it might have accomplished? Love to see the games "remastered" and not just re-released with a handful of modifications. It would take using a new engine--3d engine--and new FMV, etc., but the material is classic and would make for great gaming even now.