When backing up your mnemonic phrase, we strongly suggest employing Actual physical media, like writing about the mnemonic phrase card or simply a metallic board like the SafePal Cypher. It's also possible to retain several back-ups of it. Should you be Not sure about a certain word's spelling, use the https://onlybookmarkings.com/story18738542/not-known-factual-statements-about-bip39-explained