Amazon Simple Storage Service (S3) is an online public storage web service offered by Amazon Web Services. Conceptually, S3 is an in nite store for objects of variable sizes. An object is simply a byte container which is identi ed by a URI. Clients can read and update S3 objects remotely using a simple web services (SOAP or REST-based) interface. For example, get(uri) returns an object and put(uri; bytestream) writes a new version of the object. In principle, S3 can be considered as an online backup solution or for archiving large objects which are not frequently updated. Data stored in Amazon S3 is secure by default; only bucket and object owners have access to the Amazon S3 resources they create. Amazon S3 supports multiple access control mechanisms, as well as encryption for both secure transit and secure storage on disk. It provides a durable storage infrastructure by redundantly storing data in multiple facilities and on multiple devices within each facility. Reduced Redundancy Storage (RRS) is a another storage option within Amazon S3 that enables customers to reduce their costs by storing non-critical, reproducible data at lower levels of redundancy than Amazon S3's standard storage. It provides a cost-e ective, highly available solution for distributing or sharing content that is durably stored elsewhere, or for storing thumbnails, transcoded media, or other processed data that can be easily reproduced. The RRS option stores objects on multiple devices across multiple facilities, providing 400 times the durability of a typical disk drive, but does not replicate objects as many times as standard Amazon S3 storage, and thus is even more cost e ective.
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