Good day, just want to share my experience,
I am using 2fa as my security in my emails and exchange accounts, so one day I nearly lost my phone and that phone holds majority of my pins, 2fa, etc. so I thought I lost all, luckily I found the phone. So now I'm thinking of buying an extra phone for backup. What else do you recommend for backup?
Having extra mobile is good but I don't think it is necessary if you have a computer, you can store all your pins and 2fa backup code there and if you want you can store it in a google drive but not recommended because if someone get that then they will take all your funds.