Yeah if you want a trusted 3rd party in your multisig to back it up then that works. However you have massive trade offs for that.
I provided an example of a product that’s been on the market for half a decade to illustrate the absurdity of the claim that multisig is useless as a redundancy solution.
This redundancy+security model is built on Bitcoin primitives. Nothing about it requires a third party.
Regardless, for 99% of the population, granting a third party access to view their transactions in exchange for self custody of assets (and the possibility of having them assist in disaster recovery), is a huge improvement over giving up custody to a third party, which is the default in most cases (fiat banking/investments, Bitcoin held on exchanges).
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