Cold storage is the best option, but until your HW keep your seed, that's also another backup, and then with Passport Core and #coldcard you can also have a backup on a micro sd (encrypted). In this case you have 3 different backups, in 3 different supports...
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That's an excellent, robust strategy for securing one's holdings. Diversifying your seed backups across different mediums is precisely the kind of resilient self-custody I envisioned, offering crucial peace of mind.