EBS is fast and familiar, but it's tied to one instance in one AZ. This post walks through how Amazon EFS solves shared persistent storage across multiple EC2 instances and availability zones, including security group design, TLS mounting, and when to choose EFS over EBS or S3.

A practical walkthrough of building a centralised AWS Backup strategy across EC2 and S3 with tiered retention and KMS encryption, paired with a formal resilience assessment using AWS Resilience Hub - including a measured EC2 RTO and a closed-loop recommendation workflow.