Enabling a Bucket's Versioning State

Buckets can be in one of three states: unversioned (the default), versioning-enabled, or versioning-suspended. Once you version enable a bucket, it can never return to an unversioned state. You can, however, suspend versioning on that bucket.

Only the bucket owner can configure the versioning state of a bucket. The versioning state applies to all (never some) of the objects in that bucket. The first time you enable a bucket for versioning, objects in it are thereafter always versioned and given a unique version ID.