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RE: Do YOU have 2FA enabled? Do you use a password manager? The convenience of cutting these corners is NOT worth the risk!
I have lots of exchanges 2FA keys , API keys, it is very difficult to manage sometimes when u write those. I simply use my older smart phone i just take a snapshot of webpages for future recovery and i make sure this phone is never going to be connected to internet and is password protected. It is like having a nano ledger or keep key in low budget. i hope it is easier to recover in case i lost my main phone.
This is a perfectly valid backup mechanism for 2FA keys, I would still write the 2FA keys down though (or have some additional backup mechanism). The flash memory on the phone you use could fail at any time.
Never forget that the golden rule for backups is
x=n-1, wherexis the number of copies of your data you have, andnis the number of independent storage devices you have copies stored on.