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Amazon S3 Standard offers high durability, high availability, low latency, and high performance object storage for general purpose use. Because it delivers low first-byte latency and high throughput, Standard is well-suited for short-term or long-term storage of frequently accessed data.
Amazon S3 Standard – Infrequent Access (Standard-IA) offers the same durability, low latency, and high throughput as Amazon S3 Standard, but is designed for long-lived, less frequently accessed data. Amazon Glacier storage class offers secure, durable, and extremely low-cost cloud storage for data that does not require real-time access, such as archives and long-term backups.
To keep costs low, Amazon Glacier is optimized for infrequently accessed data where a retrieval time of several hours is suitable. Three to five hours later, the Amazon Glacier object is copied to Amazon S3 RRS.
Note that the restore simply creates a copy in Amazon S3 RRS; Amazon S3 Object Lifecycle Management is roughly equivalent to automated storage tiering in traditional IT storage infrastructures. In many cases, data has a natural lifecycle, starting out as “hot” (frequently accessed) data, moving to “warm” (less frequently accessed) data as it ages, and ending its life as “cold” (long-term backup or archive) data before eventual deletion.