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@ -438,7 +438,7 @@ When you do an RDS restore, you can change the engine type (SQL Standard to Ente
46. Redshift backups are stored on S3 and have a 1 day retention period by default and only backs up delta changes to keep storage consumption to a minimum 46. Redshift backups are stored on S3 and have a 1 day retention period by default and only backs up delta changes to keep storage consumption to a minimum
47. EC2 snapshots are stored in S3 and are incremental and each snapshot still contains the base snapshot data. You are only charged for the incremental snapshot storage 47. EC2 snapshots are stored in S3 and are incremental and each snapshot still contains the base snapshot data. You are only charged for the incremental snapshot storage
<h3>1.3 Determine appropriate use of multi-Availability Zones vs. multi-Region architectures</h3> <h3>Determine appropriate use of multi-Availability Zones vs. multi-Region architectures</h3>
1. Multi-AZ services examples are S3, RDS, DynamoDB. Using multi-AZ can mitigate against the loss of up to two AZs (data centres, assuming there are three. Some regions only have two). This can provide a good balance between cost, complexity and reliability 1. Multi-AZ services examples are S3, RDS, DynamoDB. Using multi-AZ can mitigate against the loss of up to two AZs (data centres, assuming there are three. Some regions only have two). This can provide a good balance between cost, complexity and reliability
2. Multi-region services can mitigate failures in AZs or individual regions, but may cost more and introduce more infrastructure and complexity. Use ELB for multi-region failover and resilience, CloudFront 2. Multi-region services can mitigate failures in AZs or individual regions, but may cost more and introduce more infrastructure and complexity. Use ELB for multi-region failover and resilience, CloudFront