How to: Glacier Basics
-	📒 [Homepage](https://aws.amazon.com/glacier/) ∙ [Developer guide](http://docs.aws.amazon.com/amazonglacier/latest/dev/) ∙ [FAQ](https://aws.amazon.com/glacier/faqs/) ∙ [Pricing](https://aws.amazon.com/glacier/pricing/)
-	**Glacier** is a lower-cost alternative to S3 when data is infrequently accessed, such as for archival purposes.
-	It’s only useful for data that is rarely accessed. It generally takes [3-5 hours](https://aws.amazon.com/glacier/faqs/#dataretrievals) to fulfill a retrieval request.
-	AWS [has not officially revealed](https://en.wikipedia.org/wiki/Amazon_Glacier#Storage) the storage media used by Glacier; it may be low-spin hard drives or even tapes.
-	AWS has released an even more cost effective storate tier called [Glacier Deep Archive](https://aws.amazon.com/blogs/aws/new-amazon-s3-storage-class-glacier-deep-archive/) that offers ~12 hour retrieval latencies, but costs roughly a thousand dollars per month per petabyte.

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