# Versioning {% embed url="" %} 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://fall2019.fullstackdeeplearning.com/course-content/data-management/versioning.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.