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It creates a copy of the wallet file. Bitcoin Core doesn't support recovery from just a key or seed phrase (at least, not yet).


For multibit classic, you can install openssl and use it in command lines to decrypt an encrypted private key file: openssl enc -d -p -aes-256-cbc -md md5 -a -in multibit.key -out key.txt -pass 'pass:myPassword'


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.


when you create the wallet, you will be shown the seed used. that is when you write the seed down.

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