Add DataStorage.md changes from feature-nginx-combined

docs/getting-started/quick-start/tab-docker/DataStorage.md

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+
+## Data Storage and Bind Mounts
+
+This project uses [Docker named volumes](https://docs.docker.com/storage/volumes/) to **persist data**. If needed, replace the volume name with a host directory:
+
+**Example**:
+
+```bash
+-v /path/to/folder:/app/backend/data
+```
+
+Ensure the host folder has the correct permissions.