If you worry so much about security concern since Authy have account/cloud feature, why don't you use different software such as Aegis[1] and andOTP[2] which only store the data on your device?
[1]
https://github.com/beemdevelopment/Aegis[2]
https://github.com/andOTP/andOTPI swear, never thought 2fa could get this complicated
Some people simply can't help, but make simple things complicated.