Not the poster you're replying to, but my archiving rig uses my personal fork of "tt-rss" to pull in the RSS feeds for the channels I care about and a script to query the database. That script uses yt-dlp to download the videos and subs, then marks them downloaded in the database. It's a bunch of glue-and-tape scripting code but was easy to hack together in an afternoon. Tweaking yt-dlp to run at a velocity that didn't get my IP address put into "you must login" hell was the most difficult part. The only long-term care-and-feeding has been keeping yt-dlp updated in the face of the arms race.