Backup Seeds

Remember that anyone who gets access to a quorum of your seeds (m in m-of-n) as well as your much less secure public key information can steal all of your bitcoin, so do not store store a quorum of your seeds in one place!

Redundancy

You want to backup each of your 24-word bip39 seed phrases on a piece of paper, so that you can recover if your hardware wallet is lost, defective, or destroyed. That means at a minimum you’ll have 3 pieces of paper, each with 1 seed phrase. Then, m of your seeds along with all n of your extended public key info (see Backup Public Keys) will allow you to recover your funds.

Security

Some good places to store a seed:

• Vaults at banks - safe-deposit boxes have the added benefit that in the event of your death they should naturally transfer over to your heirs.
• Safes at home/work - you may not have the security systems/monitoring of a bank, but you also don’t have to trust a third party to let you in (and no one will be peeking over your shoulder).
• Buried in a mountain - X marks the spot!
• With a trusted family member (or very close friend) - remember that if you give away m seeds, this person can spend your bitcoin.

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