This Gist Show How To Migrate S3 To Another Account

migrate_s3_to_another_account

### Source Policy IAM
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::SOURCE_BUCKET",
                "arn:aws:s3:::SOURCE_BUCKET/*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:PutObject",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::DESTINATION_BUCKET",
                "arn:aws:s3:::DESTINATION_BUCKET/*"
            ]
        }
    ]
}

### Destination Bucket Policy
{
    "Version": "2012-10-17",
    "Id": "Policy1611277539797",
    "Statement": [
        {
            "Sid": "Stmt1611277535086",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::AWS_ACCOUNT_NUMBER:root" #change with
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::DESTINATION_BUCKET/*",
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": "bucket-owner-full-control"
                }
            }
        },
        {
            "Sid": "Stmt1611277877767",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::AWS_ACCOUNT_NUMBER:root"
            },
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::DESTINATION_BUCKET/"
        }
    ]
}

### Configure aws cli with source IAM
aws configure --profile migrates3

### S3 Command To Copy Content
aws s3 cp s3://source-DOC-EXAMPLE-BUCKET/object.txt s3://destination-DOC-EXAMPLE-BUCKET/object.txt --acl bucket-owner-full-control --profile migrates3


Source:
https://aws.amazon.com/premiumsupport/knowledge-center/copy-s3-objects-account/