-dl is a public domain video and audio downloader for a wide range of sites.
youtube-dl can download from YouTube, PeerTube, and pretty much anything with a video or audio stream embedded somewhere in the page.
youtube-dl can also recurse into other video links present on the page, allowing for a full account/channel #backup
if so desired.
It can also download comments and other metadata.
Website 🔗: https://ytdl-org.github.io/youtube-dl/index.html
apt 📦: youtube-dl