Some services/applications will provide you with a security code when you are setting up the 2FA with them. This code is to be able to recover the account in case you lose the phone or device where Authy is installed. Some others do not provide that code, so if you lose your device, you will have to contact them to restore access to your accounts.
Authy has a backup feature that we recommend enabling, but remember to keep your master password in a safe place.
Authy’s support team replies are well organized and respond very quickly. That’s another reason why we recommend them.