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Putting your seed or part of it on a password manager, even with 2fa , is not safe. If a maleare install a rootkit on your pc, they will have access via cession cookies even if you have 2fa.
So it is safer to keep your seed on paper (or metal) and to have 2 copies at different locations to protect from accidental destruction or fire.
> All my crypto is on the Nano X
No, they are on the blockchain. Only your keys (ie seed) are stored in your ledger. I hope you understand that