TubeArchivist

Yt-dlp and a cron job

See if ytdl-sub is what you want.

I've been using Pinchflat for a while and so far it's been great for me. It can automatically rescan the channel or playlist on a defined time (like every day or every week), and download new videos. It uses yt-dlp so you can configure all the parameters you want it to use for the download

Metube might be right for you.

I use yt-dlp and a bash script running from cron

Some fork of youtube-dl would probably do. Personally I use JDownloader 2 (open source) to download not just from youtube but from any other sites as well. It runs locally.

+1 for MeTube. its easy to set up, works out-of-the-box for the unraid docker container (unlike others)

I'm having success with TubeSync through docker compose.

You could try out something I whipped up for this and see if it works for you: https://github.com/MattMckenzy/ToothPick

I like metube from a manually curated list

Liked videos or added to playlist requires Google login on both the viewer and the downloader and for me that is unacceptable

I use pytube and a python script I have been growing and adding features for a while. Lots of examples for you to make something that suits your own needs.

I use Metube

Jeeaaasus has a docker image on github

What have you tried searching the web for? I get many relevant results.