Nice backup tutorial @admiral. I'd suggest using 4096 size keys considering, as you said, it will be on the blockchain forever. Better to future proof it IMO!

You might be interested in my recent write-up on setting up LastPass + Duo 2FA in order to add an additional layer of hardening to the security of your account password. Check it out here:

https://steemit.com/steemit/@robrigo/security-how-to-how-anyone-can-avoid-losing-access-to-their-steemit-account-with-lastpass-and-duo