I was able to take a screenshot of GAuth backups on iPhone using the button hotkeys(IE: Power+Volume up). I setup a container that runs a go version of GAuth and used a python script to decrypt the (decrypted QR code) backup keys. Then I backed up the encrypted keyfile to offline disk, encrypted the container backup and deleted it from the hypervisor.

https://github.com/pcarrier/gauth

https://github.com/scito/extract_otp_secret_keys