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AWS Automated Backups
- AWS allows automated backups for
- ElastiCache – Redis only
- AWS does not perform automated backups for EC2 EBS volumes and needs to be manually scripted
- AWS stores the backups and snapshots in S3
- RDS supports automated backups as well as manual snapshots
- Automated Backups
- enable point-in-time recovery of the DB Instance
- perform a full daily backup and captures transaction logs (as updates to your DB instance are made
- are performed during the defined preferred backup window and is retained for user-specified period of time called the retention period (default 1 day with a max of 35 days)
- When a point-in-time recovery is initiated, transaction logs are applied to the most appropriate daily backup in order to restore the DB instance to the specific requested time.
- allows a point-in-time restore and an ability to specify any second during the retention period, up to the Latest Restorable Time
- are deleted when the DB instance is deleted
- are user-initiated and enable to back up the DB instance in a known state as frequently as needed, and then restored to that specific state at any time.
- can be created with the AWS Management Console or by using the CreateDBSnapshot API call.
- are not deleted when the DB instance is deleted
- Automated backups and snapshots can result in a performance hit, if Multi-AZ is not enabled
ElastiCache Automated Backups
- ElastiCache supports Automated backups for Redis cluster only
- ElastiCache creates a backup of the cluster on a daily basis
- Snapshot will degrade performance, so should be performed during least bust part of the day
- Backups are performed during the Backup period and retained for backup retention limit defined, with a maximum of 35 days
- ElastiCache also allows manual snapshots of the cluster
Redshift Automated Backups
- Amazon Redshift enables automated backups, by default
- Redshift replicates all the data within your data warehouse cluster when it is loaded and also continuously backs up the data to S3
- Redshift retains backups for 1 day which can be extended to max 35 days
- Redshift only backs up data that has changed and are incremental so most snapshots use up a small amount of storage
- Redshift also allows manual snapshots of the data warehouse
EC2 EBS Backups
- EBS does not provide automated backups
- EBS snapshots can be created by using the AWS Management Console, the command line interface (CLI), or the APIs
- Backups degrade performance
- Stored on S3
- EBS Snapshots are incremental and block-based, and they consume space only for changed data after the initial snapshot is created
- Data can be restored from snapshots by created a volume from the snapshot
- EBS snapshots are region specific and can be copied between AWS regions
AWS Certification Exam Practice Questions
- Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
- AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
- AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
- Open to further feedback, discussion and correction.
- Which two AWS services provide out-of-the-box user configurable automatic backup-as-a-service and backup rotation options? Choose 2 answers
- Amazon S3
- Amazon RDS
- Amazon EBS
- Amazon Redshift
- You have been asked to automate many routine systems administrator backup and recovery activities. Your current plan is to leverage AWS-managed solutions as much as possible and automate the rest with the AWS CLI and scripts. Which task would be best accomplished with a script?
- Creating daily EBS snapshots with a monthly rotation of snapshots
- Creating daily RDS snapshots with a monthly rotation of snapshots
- Automatically detect and stop unused or underutilized EC2 instances
- Automatically add Auto Scaled EC2 instances to an Amazon Elastic Load Balancer