Back up an EBS volume every day.
Save changed data rather than copying the entire volume into a separate copy each time.
Which method is most appropriate?
Use the incremental nature of EBS snapshots so subsequent snapshots store changed blocks while retaining restore points.
Detailed explanation
Later snapshots primarily store blocks changed since the prior snapshot while maintaining a complete restore chain.
Later snapshots primarily store blocks changed since the prior snapshot while maintaining a complete restore chain.
This fails the backup requirement and removes a recovery option.
This fails the backup requirement and removes a recovery option.
CloudFront is a content-delivery cache, not an EBS backup mechanism.
CloudFront is a content-delivery cache, not an EBS backup mechanism.
Copying unchanged data repeatedly increases storage and processing requirements.
Copying unchanged data repeatedly increases storage and processing requirements.
Check official documentation
Compare the following points with the official documentation.
Amazon EBS snapshotsの増分保存に関する公式説明を確認する。
What to confirm
EBSスナップショットと全量コピーの保存特性を比較できる。
Key points
- EBS snapshot
- Incremental backup
- Changed block
Notes
- Environment: AWS公式EBSドキュメントの確認
- Confirm current AWS service behavior and pricing in the official documentation.
Foundation review
Incremental chain
A later snapshot can depend on earlier snapshot data while recording only changed blocks.
Backup versus cache
A backup supports recovery; a delivery cache does not provide an EBS restore point.