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