Put them in a password manager. I use bitwarden
#asknostr who knows how to backup your keys on nostr:nprofile1qqswacu3amp428kj8wtpqf77yd2upukcn2ft4aycmxm5scmh359e0ssppemhxue69uhkummn9ekx7mp0qyg8wumn8ghj7mn0wd68ytnddakj7qg4waehxw309aex2mrp0yhxgctdw4eju6t09uvt9vcv? Keys on one place awesome. What if you get a new phone or need to reset phone though?
