How does Amazon S3 achieve high availability?

Amazon S3 achieves high availability primarily through the replication of data across multiple geographic locations. This is a core feature of S3 that ensures data durability and accessibility. By storing copies of data in multiple facilities across various regions, Amazon S3 protects against the loss of data due to hardware failures, natural disasters, or other region-specific issues. This multi-region approach means that even if one location experiences an outage, the data remains accessible from another location, significantly enhancing availability.

While content delivery networks can improve access speed and performance by caching content closer to users, they do not inherently contribute to the availability of the original data stored in S3. Unlimited storage pertains to the scalability of S3 services, allowing users to store as much data as they need, but it does not directly relate to availability. Enhanced encryption methods may protect data's confidentiality but do not impact its availability in terms of accessibility.