I have two Unraid servers at home in different rooms.
One is the Primary and has mostly flash storage and runs Plex. On this server I have most of my media including downloaded shows/movies, 4k/8k demoes, rips of all our DVD's and BD's, and home videos and Photos.
The other is a secondary and has all spinning disks (mostly IronWolf drives at this point) and has a backup of all the media that can't be easily replaced. So on the secondary I DON'T backup the 4k/8k demos, downloaded movies, and our DVD/BD backups since those are all easy to find again and instead I just keep a full Excel list of where I got all my media from and where it is stored. I do backup all the downloaded shows since most of those I have gone through and painstakingly renamed and sorted and also re-ordered the audio and sub-title tracks and I don't want to have to do that again.
I then use Both OneDrive and Google Drive to backup all my home videos and photos, or the really hard to find movies/shows that I have and some handpicked 4k/8k demos for easy finding while on the go.
My Home Videos and Photos also get written to archive BD's twice a year. In June I do a single disc of uncompressed files with just the new stuff since last June, then in December, I do a complete write with a compressed set of files sorted by 1 archive per year. Then I give those BD's to my mom who lives a few hours away to store them with her picture albums.