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