Exporting a backup

Amazon ElastiCache supports exporting your ElastiCache (Redis OSS) backup to an Amazon Simple Storage Service (Amazon S3) bucket, which gives you access to it from outside ElastiCache. You can export a backup using the ElastiCache console, the AWS CLI, or the ElastiCache API.

Exporting a backup can be helpful if you need to launch a cluster in another AWS Region. You can export your data in one AWS Region, copy the .rdb file to the new AWS Region, and then use that .rdb file to seed the new cache instead of waiting for the new cluster to populate through use. For information about seeding a new cluster, see Tutorial: Seeding a new self-designed cluster with an externally created backup. Another reason you might want to export your cache's data is to use the .rdb file for offline processing.

Before you can export a backup to an Amazon S3 bucket, you must have an Amazon S3 bucket in the same AWS Region as the backup. Grant ElastiCache access to the bucket. The first two steps show you how to do this.

Create an Amazon S3 bucket

The following steps use the Amazon S3 console to create an Amazon S3 bucket where you export and store your ElastiCache backup.

For more information about creating an Amazon S3 bucket, see Creating a bucket in the Amazon Simple Storage Service User Guide.

Grant ElastiCache access to your Amazon S3 bucket

For ElastiCache to be able to copy a snapshot to an Amazon S3 bucket, you must update your bucket policy to grant ElastiCache access to the bucket.

To create the proper permissions on an Amazon S3 bucket, take the steps described following.

Export an ElastiCache backup

Now you've created your S3 bucket and granted ElastiCache permissions to access it. Next, you can use the ElastiCache console, the AWS CLI, or the ElastiCache API to export your snapshot to it. The following examples assume that the IAM identity of the caller has the following additional S3 specific IAM permissions.

{
	"Version": "2012-10-17",
	"Statement": [{
		"Effect": "Allow",
		"Action": [
			"s3:GetBucketLocation",
			"s3:ListAllMyBuckets",
			"s3:PutObject",
			"s3:GetObject",
			"s3:DeleteObject",
			"s3:ListBucket"
		],
		"Resource": "arn:aws:s3:::*"
	}]
}

For opt-in Regions, the following is an example of what the updated policy for the S3 bucket might look like. (This examples uses the Asia Pacific (Hong Kong) Region.)

{
    "Version": "2012-10-17",
    "Id": "Policy15397346",
    "Statement": [
        {
            "Sid": "Stmt15399483",
            "Effect": "Allow",
            "Principal": {
                "Service": "elasticache.amazonaws.com"
            },
            "Action": "s3:*",
            "Resource": [
                "arn:aws:s3:::hkg-elasticache-backup",
                "arn:aws:s3:::hkg-elasticache-backup/*"
            ]
        },
        {
            "Sid": "Stmt15399484",
            "Effect": "Allow",

            "Principal": {
                "Service": "ap-east-1.elasticache-snapshot.amazonaws.com"
            },
            "Action": "s3:*",
            "Resource": [
                "arn:aws:s3:::hkg-elasticache-backup",
                "arn:aws:s3:::hkg-elasticache-backup/*"
            ]
        }
    ]
}

aws elasticache export-serverless-cache-snapshot \
    --serverless-cache-snapshot-name automatic.my-redis-2023-11-27 \
    --s3-bucket-name my-s3-bucket

aws elasticache export-serverless-cache-snapshot ^
    --serverless-cache-snapshot-name automatic.my-redis-2023-11-27 ^
    --s3-bucket-name my-s3-bucket

aws elasticache copy-snapshot \
    --source-snapshot-name automatic.my-redis-primary-2016-06-27-03-15 \
    --target-snapshot-name my-exported-backup \
    --target-bucket my-s3-bucket

aws elasticache copy-snapshot ^
    --source-snapshot-name automatic.my-redis-primary-2016-06-27-03-15 ^
    --target-snapshot-name my-exported-backup ^
    --target-bucket my-s3-bucket