S3 Standard – this class offers:

• Durability of 99.999999999% across multiple AZs – three minimum
• Low latency
• Resilient in the event of entire AZ destruction
• 99.99% availability
• An SLA governing performance
• Encryption of transit and rest data
• Lifecycle management

S3 Standard-Infrequent Access – this class offers:

• Many of the S3 Standard features such as incredible durability
• Designed for less frequent access, but still provides for responsiveness
• This class is ideal for workloads like backups
• You can actually set this class at the object level in a bucket that contains S3 Standard class objects
• Note that this class reduces availability slightly at 99.9%

S3 One Zone-Infrequent Access – this class offers:

• This might be an ideal class for objects like secondary backup copies of data
• The objects in this storage class could be replicated to another region should the need arise to increase the availability
• As you would guess, availability here is reduced slightly to 99.5%
• There is a risk of data loss in the event of an AZs destruction

S3 Glacier – this class offers:

• An ideal storage class for the archiving of data
• Access times to archived data can be from minutes to hours depending on your configuration and purchase plan