Your question is too vague. Is this a LabVIEW front panel graph that you're talking about? If you want to save the raw data, then you can just use Write to Spreadsheet File to create a delimited text file from the same data you wired to the graph. Check the documentation on how to use the Write to Spreadsheet File VI. Depending on which graph you're using and your datatype you may need to use additional functions, such as unbundling, build array, or convert from dynamic data.
