Cloud Storage always provides a strongly consistent list of objects in a single bucket, even for buckets where data is replicated across multiple regions. This means that the RTO is zero in most situations for geographically redundant storage locations. If the entire region is stopped, the existing buckets are still available and there is no need to change the storage path. Also, be aware that you need to set up geographically redundant compute instances, so that you can keep your service up and running even when certain regions are offline.