Those who are running long term investment, always have to undergo the active maintenance of seed phase, password, device for instance if your phone lost, you have to look for a way to restored everything into your new device, most people lost their seed phase, private keys and wallets that's why I have come up with little ideas especially if you're this carefree person.
It is about backup of your wallet before you store bitcoins in it. You even should try to practice recovering your wallet with your backup to make sure you know how to do it smoothly.
Backups can be a wallet file, a mnemonic seed or a private key. Whatever you do for your backup, make sure it works and you don't make any mistake in backup processing like typos.
First send your seed phase or private keys to your emails
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and makes sure have a google doc to save your wallet keys and other information.
Emails or Cloud storage like Google Drive, Dropbox, Microsoft Azzure are not safe places for you to store your sensitive information like passport, ID photo, mnemonic seed, private key. It's terrible idea.
Backup should be stored offline, on paper, metal sheet, on your devices that should be air-gap.