For Google Cloud Storage User,
Please be advised that, beginning July 14, 2015, Google will begin charging the following fees for Google Cloud Storage:
• $0.01 per GB of data transferred between buckets located in different regions of the same continent
• Egress rates per GB of data transferred between buckets located on different continents
Until then, you will be able to view your current usage in the billing details for your project in order to help you estimate the impact of these changes on your monthly spend.
For additional information and examples of this billing charge, please visit https://cloud.google.com/storage/pricing#network-regions
from Google Cloud Storage Team