Download the old rargb database, it obviously isn’t being actively updated, but has most of what I watch in movies and tv. I don’t know about music, but I found this website not too long ago. I used the spotify downloader since I have a lot of playlists on there, and I was surprised how well it worked.

I had a lot of trouble setting up nextcloud in the past but if you go with the Docker method, it’s really easy.