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I completely agree with your points — secure, offline storage and trusted wallets are essential.
Not trustwallet. That's the wallet to avoid in my experience. If you still want to use it, take your own risk. Remember. Bitcoin is a valuable asset that must be well guarded.
I’d just add that diversification matters here too. It’s risky to keep all seed phrases in one place, even if it’s offline and protected. A single fire, flood, or break-in could mean total loss.
That's also true. Seed phrases are great if stored in several places. But it must go through storage techniques that are safe from various events, including being safe when natural disasters occur. By safe, I mean not erased when burned and not lost when exposed to water.
Better to store backups in multiple secure locations, ideally not all in the same house. Just like with assets — never put all your security eggs in one basket.
At this point, the content is the same as your second paragraph. The method I can say is the same as the one above.