Is there a way to "backup" the safety feature like Google Authneticator?
2 simple step, just try to take a screenshot your barcode for the activation code. And try to back up your secret.
Websites are supposed to have a way for you to get back in if you lose your 2FA device. Currently, many BTC websites don't have a way to get back in.
You should check how you can get back into your account if you lose your 2FA device for each website you use.
Because the key is our account. The exchange site does not have a responsibility with it. Because Google 2fa based on 3rd parties. Exchange sites don't have any responsibility for it.