As I understand it, using dumpwallet for a non-descriptor wallet in Core will give you the wallet seed in WIF format. This seed can then be used with sethdseed in a new wallet, thereby recovering the original wallet. So in effect, one can make a paper backup of a Core wallet.
But with descriptor wallets, dumpwallet does not work.
Is there a way to make a paper backup of a Bitcoin Core descriptor wallet?
There is currently no way to make such a backup of a Bitcoin Core descriptor wallet. There are open PRs that will allow you to export the descriptors stored in the wallet, however these have not been merged yet.