2.My Recording book
I have a long hard shelled book that i use for keeping records of all the airdrops and bounties i promoted because sometimes i used to forget easily so i write down my recovery seeds in this book as well
3. Flash Drive
I have a good 8gig flash drive as well that i use to copy software and files from one pc to another so i format this flash drive and copy my private keys and recovery seeds in it.
This is the best method on what you listed this two will really help a lot if you can't afford to buy a hardware wallet like trezor and many more plus this is the method that I'm also using to keep my passwords and different private keys for my accounts. I can't totally recommend the hard drive method because a hard drive can easily be corrupted (base on my experience).