What if you lose the password of that zip file? I mean you can host even your wallet.dat file (can rename it or even encrypt it within a video/song/image if your password is long enough it would be hard to break the file).
Other things you could do personally I am also a lover of these BIP39 seeds cuz with them I can keep multiple addresses and not just for bitcoin!:
- You take some poem and take every first word of a sentence and see if it can generate the keys from those words.
- You take some book like harry potter and starting from the page X to an page X+11 you take every first/last word of the page and see if you can generate the keys. (or from every 5th row etc.)
- Or even generate the keys and engrave them onto a metal plate that you will keep with yourself
There are a lot of ways you just need to be creative!
By storing them online you still trust the 3rd party that their servers won't fall apart. Maybe don't save all in one zip but rather put them on multiple locations divided.
Great ideas. So would you memorize the book and page number? It may be better to go with something that's not physical. What if you lose the book or your spouse/parent throws it away (lol). That way you could like google the declaration of independence or something and know it starts at line XYZ.