Tips/ideas for automatically downloading youtube videos from specific channels? (on Linux)

In the light of google cracking down on ad block i want to be pro-active and automatically download new videos to my jelly fin server.

I was thinking off using this tool https://youtube-dl.org/ and writing a small script for it (with help of gpt4) but i am missing any general strategy on when i should trigger it and how to make sure it downloads all of the new videos exactly once.

I am hoping that i am not the first to do this and people can give me some good tips before i put to much work into this project.