Add the option to use service accounts to access the Google Cloud Storage instead of using the client API key and the web address. This would allow local instances of the site to still work (e.g. no OAuth), and is the Google recommended practice for server to server communication.
Additionally, it is more secure since you are only authorizing a specific service account user, and can control what that user has access to.
This idea was posted in UpdraftPlus - backup/restore plugin and tagged backup, cloud, gcloud, google, storage on December 19, 2017 by 
andreweiche.
Hi!
I was extremely dissapointed when Updraft didn’t support service accounts for object storage access. I will not give my wordpress installation / updraft access to all our Google Cloud content, so this “feature” as is now is unusable…