====== EBS Snapshot ======

**What it is:** A point-in-time backup of an EBS volume (stored in S3 behind the scenes).

**What it’s for:**
  * Backup and disaster recovery.
  * Create new volumes from snapshots.

**Key ideas:**
  * The first snapshot is full; later snapshots are incremental (common behavior).
  * You can copy snapshots across Regions for DR.

**Exam cues:**
  * “backup EBS volume” → snapshot.
  * “restore volume in another AZ” → create volume from snapshot.

**Hard words:**
  * *point-in-time* /ˌpɔɪnt ɪn ˈtaɪm/: tại một thời điểm
  * *incremental* /ˌɪnkrəˈmentl/: tăng dần (chỉ lưu phần thay đổi)
  * *disaster recovery* /dɪˈzæstər rɪˈkʌvəri/: khôi phục thảm họa