I wrote down the seed phrase of my wallet in the notebook. I have it set to my Google Drive for extra security. I know that even if my notebook somehow gets corrupted, the wallet seed phrase stored in my Google Drive won't. Because as long as I have Gmail I think I can safely recover my wallet passphrase. This method seems to be the best method to me.
Writing your seed phrase down or envraving it in steel and providing backups of it in more than one location is probably the best way to store your seed phrase, but to store it in Google drive, cloud services or anywhere that is online is not recommended, take note that whatever is stored online is prone to hacking and you can lose your seed phrase in this way. If you are afraid of a single point of failure, extend your seed phrase with a passphrase or set up a multisig wallet.