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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
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
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