> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mage.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Backfill guide

> How to create a backfill.

1. From the pipelines list page, click a pipeline to go to the pipeline detail page.
2. In the vertical navigation bar on the left side of the screen, click the link for <b>Backfills</b>.
3. Click the button labeled <b>+ Create new backfill</b>.
4. Under the section labeled <b>Backfill type</b>, select <b>Date and time window</b> card.
5. Enter a name for your backfill.
6. Select a start date and time.
7. Select an end date and time.
8. Select an interval type; this value will help determine how many pipeline runs to create.
9. Enter an interval unit; this value is multiplied by the interval type to determine how many pipeline runs to create.
10. Click the button labeled <b>Save changes</b>.
11. Once the backfill is successful saved, click the button labeled <b>Start backfill</b>.

Check out this [blog article](https://www.mage.ai/blog/backfilling-historical-data-using-mage) for more details!