Google Cloud Platform for Developers

Object versioning

We mentioned object versions as part of lifecycle management configuration rules. As we covered earlier, all objects in Cloud Storage are immutable, meaning they cannot be changed. When an object is re-uploaded to Cloud Storage, the original object is deleted and a new object takes its place. In order to support object retrieval and revert changes, Cloud Storage supports object versioning, enabled at the bucket level.

With object versioning, every object in the bucket will receive a generation number. When an object in a versioned bucket is overwritten, instead of being deleted, it will be archived. The new version will receive an incremented generation number, and all requests for the object will be satisfied by the new ...