If your Amazon S3 storage costs are higher than you thought they would be following an AWS DataSync transfer, it might be due to one or more of the following reasons:
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When transferring to or from S3 buckets, you incur costs related to S3 API requests made by DataSync.
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DataSync uses the Amazon S3 multipart upload feature to upload objects to S3 buckets. This approach can result in unexpected storage charges for uploads that don't complete successfully.
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Object versioning might be enabled on your S3 bucket. Object versioning results in Amazon S3 storing multiple copies of objects that have the same name.
Actions to take
In these cases, you can take the following steps:
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Make sure you understand how DataSync uses S3 requests and how they might be affecting your storage costs. For more information, see Evaluating S3 request costs when using DataSync.
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If the issue's related to multipart uploads, configure a policy for multipart uploads for your S3 bucket to clean up incomplete multipart uploads to reduce storage cost. For more information, see the AWS blog post S3 Lifecycle Management Update - Support for Multipart Uploads and Delete Markers
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If the issue's related to object versioning, disable object versioning on your S3 bucket.
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If you need more help, contact AWS Support Center
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