> For the complete documentation index, see [llms.txt](https://fall2019.fullstackdeeplearning.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fall2019.fullstackdeeplearning.com/course-content/data-management/versioning.md).

# Versioning

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Versioning - Data Management
{% endembed %}

## Summary

* Data versioning refers to saving new copies of your data when you make changes so that you can go back and retrieve specific versions of your files later.
* In **Level 0**, the data lives on the filesystem and/or object storage and the database without being versioned.
* In **Level 1**, the data is versioned by storing a snapshot of everything at training time.
* In **Level 2**, the data is versioned as a mix of assets and code.
* **Level 3** requires specialized solutions for versioning data. You should avoid these until you can fully explain how they will improve your project.


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