If the file has already been saved, click the File | Save command or click the button on the Quick Access Toolbar to update the saved file. If the file has not been saved previously, the Save As dialog appears when File | Save is selected.
A Grapher GRF file saves only the graph and plot options and a link to the data file. If the source data for the file has not been saved, a message is displayed asking if you'd like to save the data file. If you close the data file without saving, the data necessary to recreate the graph will be lost. If you wish to embed the source data with the graphs, save a Grapher Project GPJ file instead.
Use the File | Save To Multi-Sheet Excel File command to save multiple worksheets in a single Excel document.
A file can be saved in an Excel format from Grapher worksheet, but only one worksheet can be saved when using the File | Save or File | Save As command. If a multi-worksheet Excel file is opened and saved as an .XLS or .XLSX file from the Grapher worksheet, be aware that only the single worksheet is saved in the document. If the existing file is overwritten, all the unused worksheets are destroyed. In this case, a warning message is issued. The message reads: Saving this worksheet will destroy all but one of the sheets in the existing *.xls, *.xlsx file. To overwrite the file, click OK. To choose a different file name, click Cancel.
When saving files opened with the File | Open Excel command, note that the save button on the toolbar does not save the .XLS file. To save the .XLS file in the Excel window, choose the File | Save As command and save to the same file name as the open file. This is a limitation of the Microsoft Excel interface.