Yes there are four options available for datafeed file transfer and FTP is one of them. The CSV download which you are seeing in the portal is only for column meta download and won't contains the actual data.
If you go with Adobe professional services than they might be able to help with data extraction and insertion both however if you want to go with custom API route then You can extract required data by using data feeds. This will provide you the option to extract the data into CSV format from specific report suite and also for a specific time interval. You can also apply filters in the raw CSV data as needed to extract the info you want and then you can ingest this data into Production by using the custom API approach as suggested in above post.