This post guides users on how to create an AWS S3 bucket for storing Postgres backups. It is the first part of a two-part series on automating nightly backups for multiple Neon projects, which can be useful in multi-tenant architectures with one project per customer. The process involves setting up an OIDC Identity Provider, creating a role, and creating an S3 bucket with its corresponding policy. These steps are crucial to enable the use of AWS credentials by the GitHub Action for backing up data from Neon projects to S3 every night.