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?
I use authy as well and can recommend it. I have lost my phone before and was able to restore it without a problem. If I hadn't used authy and just continued to use 2fa with Google Authenticator I would have been stuffed. It was worth the time it took to setup.
Also during most 2fa setup you get the opportunity to write down the secret key to bypass the 2fa, if for whatever reason you can't access your 2fa app. This is worth storing somewhere offline on a piece of paper, it may help you get out of trouble as well.