> For the complete documentation index, see [llms.txt](https://docs.finops.softwareone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finops.softwareone.com/system/data-sources/amazon-web-services/request-historical-data.md).

# Request Historical Data

When you create a Cost and Usage Report in an AWS-linked account, the S3 bucket is automatically populated with data from the beginning of the current month. 

However, if the AWS account has existed for longer than this period, you can request a backfill of historical cost and usage data.

## Requesting a backfill of your cost data

To request a backfill of your historical data, create a support case with AWS. 

For information on how to open a support case and the information to include in your request, see the following link in the AWS Data Exports User Guide:

<https://docs.aws.amazon.com/cur/latest/userguide/troubleshooting.html#backfill-data>

## Performing a billing reimport in FinOps <a href="#perform-a-billing-reimport" id="perform-a-billing-reimport"></a>

To perform a billing reimport in FinOps for Cloud:

1. Navigate to the **Data sources** page.
2. Select the AWS data source containing the updated S3 bucket, then select **Billing reimport**.
3. In **Import from**, choose the start date of your historical billing data.
4. Select **Schedule import**.&#x20;

<div data-with-frame="true"><figure><img src="/files/wKjBDBGiVWkBzq0luG28" alt=""><figcaption><p>The option to reimport billing data.</p></figcaption></figure></div>

Once the import process has been initiated, it might take several hours for the process to complete, depending on the amount of historical data.&#x20;


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