I’m a third vote for Soundiiz. With Soundiiz, you can keep track of saved artists, albums, songs, and playlists across music services. And, you can transfer these saved items from one service to another whenever you migrate. Soundiiz serves as a meta platform.
Some of this Soundiiz functionality is free. If you come up against a paywall, you can pay for just a month to transfer things around. (I pay monthly for the ability to update Spotify's dynamically changing playlists in Tidal, which Tidal playlists are then accessible in Roon.)
I take an opposite view from lalitk. He prefers a proprietary app. I want a manufacturer agnostic app because I don’t want my content to be tied to the health of any specific device or manufacturer.
So, yes, you can back up all of your saved music from Qobuz to Soundiiz. If you’d like additional redundancy, from there you can then back up your saved music to Spotify/Tidal etc.