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‫Now let's talk about Amazon S3 Replication,

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‫and there are two flavors of it.

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‫So CRR is for cross-region replication

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‫and SRR is for same-region replication.

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‫The idea is that we have an S3 Bucket in one region

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‫and a target S3 Bucket in another region,

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‫and we want to set up asynchronous replication

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‫between these two buckets.

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‫So, to do so, we first must enable Versioning

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‫in the source and the destination buckets.

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‫And if we do CRR, so cross-region replication,

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‫the two regions must be different.

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‫If we do SRR, the two regions are the same.

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‫Now, it's possible for you to have these buckets

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‫in different AWS accounts

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‫and copying happens asynchronously.

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‫So the replication mechanism happens behind the scenes,

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‫in the background.

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‫And to make replication work,

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‫you must give proper IAM permissions

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‫to the S3 service so that it has the permission

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‫to read and write from specified buckets.

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‫So the use cases for replication are manyfold.

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‫The first one is that if you use cross-region replication,

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‫this can be helpful for compliance

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‫or for providing lower latency access to your data

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‫because it's in another region,

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‫or to replicate data across accounts.

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‫For SRR, or same-region replication,

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‫this can be very helpful to aggregate logs

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‫across multiple S3 Buckets

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‫or to perform a live replication

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‫between a production and test accounts,

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‫so, you have your own test environment.

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‫Okay, so that's it about replication.

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‫I will see you in the next lecture for some practice.