Add a method to copy a sheet with all data and formatting because there are no back-up or undo options for add-ins.
Since there is no way to cancel the changes made by an add-in, we need to provide users with backup options.
now we have this API please use it!
here the details: https://github.com/OfficeDev/office-js-docs/blob/ExcelJs_OpenSpec/reference/excel/worksheet.md#copypositiontype-worksheetpositiontype-relativeto-worksheet
Copy a worksheet and place it at the specified position. Return the copied worksheet.
Andrea De Gouveia commented
Dear Office Extensibility Team,
Would be very useful.