AWS Classroom Notes – Storage – 21/Nov/2019

Exercise

1. Create an EC2 instance with 10 GiB of EBS volume (Any Linux) (10 mins)
2. Backup of Volume.
3. From Backup create a new Volume (in same/different region)

Creating Snapshot of Volume

• Manual:
  • Creating a Snapshot of the Volume
• Automated:
  • AWS CLI to create a backup and then run this script periodically.
• Scheduled Backups

Creating Volume from Snapshot

• Creates the volume from snapshot in the same region (where snapshot exists).
• User can select the AZ.

Creating Volumes in Different Regions from Existing Snapshots

• Copy the snapshot to your desired Region
• Using the copied snapshot create Volume

How Snapshot Creation Works

• First snapshot of the volume is Full disk back up.
• All the snapshots after first will be incremental backups.

How about Snapshot deletions

• Scenario: you have two snapshots as shown below

• If any other snapshot is depending on the current snapshot to be deleted, then contents of the current snapshot will be copied to snapshots depending on it

• If there are no depending snapshots on current snapshot , then the Snapshot is deleted. (so the change will be lost)

• Deleting Snapshot A:

• Deleting Snapshot B:

• Deleting the Latest snapshots might lead to data loss, but older snapshots will not lead to data loss.