# Source control and file storage in Amazon SageMaker Unified Studio
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Every project in Amazon SageMaker Unified Studio includes S3 shared storage by default. S3 shared storage is active from the moment a project is created and requires no administrator configuration. All project members can immediately read, write, and share files.

Repositories are an optional, additive capability. When you configure a Git connection at the domain level, project members can add repositories to their projects for version control, branching, and commit-based collaboration. Adding repositories does not replace or disable S3 shared storage. Both options coexist in the same project.

As an administrator, your responsibilities include:
+ Understanding the default S3 shared storage behavior (see [Default S3 storage](configuring-s3-storage.md))
+ Setting up Git connections if your teams need repository-based version control (see [Git connections](git-connections.md))
+ Configuring cross-account permissions if your domain and tooling environments are in different accounts (see [Cross-account and cross-region Git configurations](cross-account-git.md))

**Important**  
On July 30, 2026, Amazon SageMaker Unified Studio launched a new repository experience that provides per-artifact version control, multi-repository support, and branch-based collaboration. For documentation, see [Git connections](git-connections.md). If your domain uses the previous force-push based storage model (where every save pushes directly to the remote), see [Legacy experience and migration](legacy-git.md) for documentation on that experience. For migration details, see [Migrating to the new repository experience](legacy-git.md#admin-migration).

## Storage options
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Amazon SageMaker Unified Studio supports the following storage options for project files.

### S3 shared storage
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S3 shared storage is the default option. It uses Amazon Simple Storage Service to provide a shared storage area for project files. All project members have read, write, update, and delete access to the shared storage area. This storage operates on a last-write-wins principle, meaning that files are immediately visible to all project members when modified. Team members must coordinate when working on the same files to avoid overwriting each other's changes.

### Repositories
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Repositories provide version control through Code Connections to GitHub, GitHub Enterprise Server, GitLab, GitLab Self-Managed, and Bitbucket. Repositories are additive. Administrators make them available by configuring Git connections at the domain level.