Incremental Dataset Export Options in AEP

Hi everyone, 

Using AEP Query Service, we have created a derived dataset by joining selected fields from the Profile dataset and the Event dataset, along with performing deduplication. The resulting data is stored in a derived dataset, which we then export to cloud storage destinations such as SFTP or a data landing zone in Azure.

How can we perform this export action incrementally using Data Distiller and dataset export in Destinations?

Currently, we do not have the option to export dataset files in CSV format. Can this use case be achieved by using Audiences instead, and exporting the audience in CSV format? The solution should also support incremental export.

Could someone help us with the best option to achieve this?Data distiller or using Audiences 

Thanks!