Do you mean volume data?

If you need to download a local copy of specific files from a volume, you can do so through the Console tab of your service. From there, you can use a command-line utility such as zip (or another similar tool) to compress a folder, then download the resulting file using the file browser, which is also available in the Console tab. Alternatively, you can use Railway’s built-in backups: https://docs.railway.com/volumes/backups