Rather than storing entropy, shop the mnemonic generated with the entropy. Steganography might be advantageous when storing the mnemonic. The random mnemonic generator on this site works by using a cryptographically safe random range generator. The built in random generator can normally be trusted in excess of your own instinct https://www.livebinders.com/b/3631513?tabid=7dd978d9-81c0-05c0-ecba-7d3b4f616e73