Basically the SDKs give you the option to work with the data through a REST API. There are no options to export it to a file, but you can easily do this with the tools available in the programming languages that you are using.
Let's assume that you are using a .NET development environment.
1. Create a simple .NET project or a one that you are using for processing your data.
2. Create a model for the content type
in Backend Services that you are using to save the data from the barcodes.
3. Get the data objects from the server.
4. Deserialize the .NET objects into CSV, JSON, TXT or whatever format you need to export them using the available tools in the .NET framework.
I hope that this helps. Let me know if you have further questions.