Comparison of AWS Storage Classes

From the AWS Documentation on Storage Classes
Storage Class Durability (designed for) Availability (designed for) Other Considerations
STANDARD 99.999999999% 99.99% Default storage class
STANDARD_IA 99.999999999% 99.9% There is a retrieval fee for STANDARD_IA objects.

This class is most suitable for infrequently accessed data.

For storing backups

Suitable for objects larger than 128 KB that you plan to store for at least 30 days

If you delete an object before the 30-day minimum, you are charged for 30 days.
ONEZONE_IA 99.999999999% 99.5% Not resilient to the loss of the Availability Zone.

Suitable for objects larger than 128 KB that you plan to store for at least 30 days

Less expensive than STANDARD_IA

For object replicas when setting cross-region replication (CRR).
GLACIER 99.999999999% 99.99% (after you restore objects) GLACIER objects are not available for real-time access.

You must first restore archived objects before you can access them.

These remain Amazon S3 objects that you manage in Amazon S3,  you cannot access them directly through Amazon Glacier
RRS, Reduced Redundancy Storage 99.99% 99.99% For noncritical data

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