First send your seed phase or private keys to your emails, also use them to compose a little song only can listen anytime, write it down in your diaries, and makes sure have a google doc to save your wallet keys and other information.
Lots of people have lost their coins by storing their seeds in email which got hacked.
Writing a song is not useful, the seed format is already mnemonic, it was created to be easy to memorize, but memory shouldn't be your primary or even secondary method.
Google doc has the same drawbacks as email.
If you decide to store it in online storage, at least encrypt it with strong algorithm and a strong and random password.