The issue is known as ID [PPS-13866] and [EXT-4317], but unfortunately it is completely a Google issue. If their systems deem traffic to be illegimitate, the only solution for you will be to experiment with the above mentioned
[ext-google-drive-backup]
RequestTimeout = 300
ConnectionTimeout = 15
MaxResumeAttempts = 15
MaxResumeFailures = 15
PauseBetweenAttempts = 40
entries. It is recommended to play with the Resume values and the pause between attempts. Do longer pauses and increase the resume attempts. There is nothing else that can be done from the user side, because the control over what Google allows and what it does not is alone with Google. If this does not work, you should consider switching the storage provider.
[ext-google-drive-backup]
RequestTimeout = 300
ConnectionTimeout = 15
MaxResumeAttempts = 15
MaxResumeFailures = 15
PauseBetweenAttempts = 40
entries. It is recommended to play with the Resume values and the pause between attempts. Do longer pauses and increase the resume attempts. There is nothing else that can be done from the user side, because the control over what Google allows and what it does not is alone with Google. If this does not work, you should consider switching the storage provider.