====== Versioning ======

**What it is:** Keeping multiple versions of an object in the same bucket.

**What it’s for:**
  * Protect against accidental deletes/overwrites.
  * Enable recovery to a previous version.

**Key ideas:**
  * When enabled, deletes create a **delete marker** rather than removing all versions.
  * Versioning helps with rollback and audit.

**Exam cues:**
  * “recover deleted object” → enable versioning.
  * “protect from overwrites” → versioning.

**Hard words:**
  * *overwrite* /ˌoʊvərˈraɪt/: ghi đè
  * *marker* /ˈmɑːrkər/: dấu đánh dấu
  * *rollback* /ˈroʊlˌbæk/: quay lui phiên bản