If you use
SmartChart (an SFX Smart Dashboard plugin that my team made), it can export data to a CSV file. It also has a bunch of other neat features, like graphing based on time or being able to reset without making a new graph. More features are on the way, like zooming. The file to download is at
https://github.com/Nashoba-Robotics/SmartChart/releases
You could also write a way to save the CSV file on the roboRIO and then use
FTP to get the file out. It shouldn't be too complex to write, since CSV is a super simple protocol.