maybe consider using shamir backup..
Thanks, always open for useful suggestions.
As the NANO-S is somewhat limited, i consider some upgrade in the future, but i had some doubts (not so much related to security) to buy a trezor in the past, but i am going to look into it again soon.
Just write a big note to yourself saying "Ich habe meine Bitcoins versteckt" even if someone sees the note, they wont know where thay are versteckt, and you can go searching your surroundings immediately instead of spending half a day swetting in angst.