Google Cloud Storage provides the feature of Cloud Interoperability.
It has 3 ways of achieving cloud interoperability:
Storage Transfer Service enables you to import large amounts of online data into Cloud Storage from Amazon Simple Storage Service (Amazon S3) buckets and general HTTP/HTTPS locations.
Storage Transfer Service can optionally schedule transfers, delete source objects, and select which objects are transferred.
The Cloud Storage XML API is interoperable with some cloud storage tools and libraries that work with services such as Amazon Simple Storage Service (Amazon S3) and Eucalyptus Systems, Inc.
The gsutil tool lets you access Cloud Storage from the command line. It can also be used to access and work with other cloud storage services that use HMAC authentication, like Amazon S3.
For more info refer https://cloud.google.com/storage/docs/interoperability