The guys at Liana Wallet proposed a BIP for encrypted wallet backups (descriptors, labels, transaction history, and other stuff) and now the latest release of Liana Wallet lets you see how it works in the wild.

Encrypting the backup of your wallet descriptor, labels and state is handy because, especially in the case of multisigs, you can't spend without the descriptor (even if you have a quorum of keys -- the descriptor tells your wallet software how to put the keys together). But by itself the descriptor doesn't pose the same kind of security risk as your keys (someone who has the descriptor can see all your transactions, but can't spend). So you probably don't want to just store your descriptor anywhere, but you also can't risk losing it. This new scheme encrypts the descriptor with the pubkeys of the keys used in your multisig so that any one of those keys can decrypt it. You can safely store the encrypted descriptor in something like cloud storage for availability.

There is a good (Delving Bitcoin) thread) about the scheme as well.

Liana Wallet is a miniscript powered Bitcoin wallet that lets you set timelocks on your coins and does a pretty good job helping you with coordinating multisigs.