Understanding Amazon S3 Storage Classes

Jay Tillu
5 min readMay 12, 2024


Amazon S3 Storage Classes — Jay Tillu

Data storage is a constant concern in today’s digital world. You need a solution that’s flexible, cost-effective, and secure. Amazon S3 offers a wide range of storage classes to satisfy your data’s specific needs.

Amazon S3 offers several storage classes, each tailored to different use cases and cost requirements. These classes enable users to optimize storage costs based on the access frequency and durability needs of their data. Amazon S3 provides the following storage classes:

1. S3 Standard

  • Designed for frequently accessed data
  • Stores data in a minimum of three Availability Zones

This is the default storage class. Amazon S3 Standard provides high availability for objects. This makes it a good choice for a wide range of use cases, such as websites, content distribution, and data analytics. It offers high performance, low latency, and immediate retrieval.

2. S3 Standard-Infrequent Access (S3 Standard-IA)

  • Ideal for infrequently accessed data
  • Similar to Amazon S3 Standard but has a lower storage price and higher retrieval price.

Amazon S3 Standard-IA is ideal for data infrequently accessed but requires high availability when needed. Both Amazon S3 Standard and Amazon S3 Standard-IA store data in a minimum of three Availability Zones. S3 Standard-IA provides the same level of availability as Amazon S3 Standard but with a lower storage price and a higher retrieval price.

3. Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA)

  • Stores data in a single Availability Zone
  • Has a lower storage price than Amazon S3 Standard-IA

Compared to Amazon S3 Standard and Amazon S3 Standard-IA, which store data in a minimum of three Availability Zones, Amazon S3 One Zone-IA stores data in a single Availability Zone. This reduces costs even further but comes with slightly lower durability compared to S3 Standard-IA. This makes it a good storage class to consider if the following conditions apply:

  • You want to save costs on storage.
  • You can easily reproduce your data in the event of an Availability Zone failure.

4. Amazon S3 Intelligent-Tiering

  • Ideal for data with unknown or changing access patterns
  • Requires a small monthly monitoring and automation fee per object

This intelligent storage class automatically manages data placement between different S3 access tiers (Standard, S3 Standard-IA, and Glacier) based on its access patterns.

In the Amazon S3 Intelligent-Tiering storage class, Amazon S3 monitors objects’ access patterns. If you haven’t accessed an object for 30 consecutive days, Amazon S3 automatically moves it to the infrequent access tier, Amazon S3 Standard-IA. If you access an object in the infrequent access tier, Amazon S3 automatically moves it to the frequent access tier, Amazon S3 Standard. This helps optimize costs for data with unknown or changing access needs.

5. Amazon S3 Glacier Instant Retrieval

  • Works well for archived data that requires immediate access
  • Can retrieve objects within a few milliseconds

Amazon S3 Glacier is Archivel Storage. When you decide between the options for archival storage, consider how quickly you must retrieve the archived objects.

  • Storage Cost: This is where Glacier Instant Retrieval shines. It offers significantly lower storage costs, up to 68% cheaper compared to S3 Standard-Infrequent Access (S3 Standard-IA). This makes it perfect for long-term archival of data that you rarely access.
  • Retrieval Cost: There’s a trade-off for the lower storage cost. Retrieving data from Glacier Instant Retrieval incurs a higher cost per GB compared to S3 Standard. This is because Glacier Instant Retrieval prioritizes keeping data readily available for quick retrieval while archived.

6. Amazon S3 Glacier Flexible Retrieval

  • Low-cost storage designed for data archiving
  • Able to retrieve objects within a few minutes to hours

Amazon S3 Glacier Flexible Retrieval is a low-cost storage class that is ideal for data archiving. For example, you might use this storage class to store archived customer records or older photos and video files.

7. Amazon S3 Glacier Deep Archive

  • Lowest-cost object storage class ideal for archiving
  • Able to retrieve objects within 12 hours

Amazon S3 Deep Archive supports long-term retention and digital preservation of data that might be accessed once or twice a year. This storage class is the lowest-cost storage in the AWS Cloud, with data retrieval from 12 to 48 hours. All objects from this storage class are replicated and stored across at least three geographically dispersed Availability Zones.

Choosing the Right Class

The key to selecting the optimal S3 class lies in understanding your data access patterns and budget. Here are some pointers:

  • Frequently accessed data: Use S3 Standard for the best performance and immediate retrieval.
  • Less frequently accessed data: Consider S3 Standard-IA, S3 One Zone-IA, or S3 Intelligent-Tiering based on cost sensitivity and retrieval needs.
  • Archive data with occasional retrieval: S3 Glacier Instant Retrieval might be suitable.
  • Rarely accessed archive data: Opt for S3 Glacier Flexible Retrieval or S3 Glacier Deep Archive depending on acceptable retrieval times.

Remember, you can also define lifecycle rules to automatically transition data between S3 storage classes based on predefined criteria. This helps optimize costs for data with evolving access patterns. By understanding the different S3 storage classes, you can leverage the most cost-effective and efficient solution for your specific data storage needs in the cloud.


In conclusion, Amazon S3 offers a variety of storage classes to cater to diverse needs. By understanding the access patterns, durability requirements, and budget constraints of your data, you can choose the most cost-effective storage class. S3 Standard is ideal for frequently accessed data, while S3 Glacier offers the lowest storage costs for rarely accessed archives. Explore options like S3 Intelligent-Tiering for data with unknown access patterns and S3 One Zone-IA for cost savings with slightly lower durability. Remember, there’s a trade-off between access speed, storage cost, and retrieval cost. Choose the class that best balances these factors for your specific data needs.

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Jay Tillu

I am Frontend Web Developer and Hobbyist Blogger. As a Web Developer, I hold expertise in HTML, CSS, JavaScript, and React.