Those are quite long but you can write those on paper which you can store in a vault or something.
Just make sure to backup all descriptors for both internal and external chain, that makes 8 parent descriptors to backup (by default).

You can test if it'll restore the correct keys by creating a blank wallet, import them all and use the command: getaddressinfo "address" to see if it's "ismine" and "solvable" 'true'.
Use the command on your addresses of different script type, including the change.