# Transfer data into Iceberg managed table

> [!WARNING]
>
> **Preview**
>
>
> This feature is
>
> subject to the "Pre-GA Offerings Terms" in the General Service Terms section of the
> [Service Specific
> Terms](https://docs.cloud.google.com/terms/service-terms#1).
>
> Pre-GA features are available "as is" and might have limited support.
>
> For more information, see the
> [launch stage descriptions](https://cloud.google.com/products/#product-launch-stages).

> [!NOTE]
> **Note:** To get support or provide feedback for this feature, contact [dts-preview-support@google.com](mailto:dts-preview-support@google.com).

The BigQuery Data Transfer Service lets you automate append-only data transfers from external
sources, such as Amazon Simple Storage Service (Amazon S3), Azure Blob Storage, and Cloud Storage, into
Iceberg managed table.

## Data sources supported

You can specify Iceberg managed table as the destination table type
when you set up your transfer configuration for these data sources:

- [Amazon S3](https://docs.cloud.google.com/bigquery/docs/s3-transfer)
- [Azure Blob Storage](https://docs.cloud.google.com/bigquery/docs/blob-storage-transfer)
- [Cloud Storage](https://docs.cloud.google.com/bigquery/docs/cloud-storage-transfer)

## Limitations

Transfers to Iceberg managed table are subject to the following limitations:

- **Append-only:** Data is only appended to the destination table. Overwriting, updating, or deleting existing data is not supported.
- **Partitioning limitations:** Partitioning is supported on the destination Iceberg managed table, but some limitations apply. For more information, see [Partitioning limitations](https://docs.cloud.google.com/bigquery/docs/biglake-iceberg-tables-in-bigquery#partitioning_limitations).
- **No backfills:** Transfers do not support [backfills](https://docs.cloud.google.com/bigquery/docs/samples/bigquerydatatransfer-schedule-backfill).

## Pricing

For information on BigQuery Data Transfer Service pricing, see the
[Pricing](https://cloud.google.com/bigquery/pricing#data-transfer-service-pricing)
page.

After data is transferred to Iceberg managed table, standard storage
and query [pricing](https://docs.cloud.google.com/bigquery/docs/iceberg-tables#pricing) applies.