Recording to a DVD recorder
To begin with I am "old school".
What I want to do is record something/a show that is on a channel I access thru Roku onto a DVD Recorder (not cloud recording). I want to record in onto a DVD.
I have a smart TV but NOT a Roku TV - I have a Roku Express 39000X attached to the TV.
The recorder is hooked up to my TV.
Is it possible to do?
It's not really possible and in the age of "on-demand" you shouldn't need to. Keep in mind that your 3900 only has a digital output (HDMI) and your DVD recorder only has analog inputs (RCA/composite video; those Red/White/Yellow connectors). Any solution, which may not work due to copy protection, would require an HDMI-to-RCA converter between the Roku and the DVD recorder. You'd then be watching the Roku through the DVD recorder and the results may not be acceptable visually (i.e., not HD).