A thought experiment i wanted to know.
I have saved it in a disc (was inspired by satoshi who stated it that he has saved it and buried it)
memorised and saved in hdd in air gapped though!
The question has been discussed before, and I don't think this thread is for this board. That is not withstanding, different answers will still appear. There are divers ways one can store or keep his or her phrase seed or wallet key. You can store your key in the way that is safe for you. There have been different suggestions that have been made by different users in the forum. You can store your phrase seed in a flash drive, memory card, CD plate, your brain or tell your spouse, children or very close relative. Any way that is suitable for you. Do it. But all of them have Merit and demerit. That is advantages and disadvantages.
If I will suggest for you, I will suggest papper wallet storing. Write out the phrase seed in a paper mostly in a jotter, and keep the jotter in your walldrop or you can catalogue the jotter.