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Well I would say it's reasonably safe if used properly, there was also another hardware wallet I don't remember it's name that was also pretty decent, it doesn't just stored the coins safely but it also anonymized it, I don't remember it's name.

my greatest fear is to lock myself out.
too secure.

Then keep backups in secure hidden places that nobody knows about. There are many way to organize a secure storage of some coins, with multiple layers of backups. You just need to be creative.

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