If you expect to make changes in a workbook later, and want to be sure that the changes are updated on the associated Web page, you can choose to AutoRepublish items each time the original workbook is saved.
If you are publishing to a public location, do not add confidential information to the workbook. Should you decide later that you no longer want to automatically republish an item in the workbook to a Web page each time the workbook is saved, you can disable AutoRepublish.
To specify whether an item in the workbook is automatically republished, select or clear the AutoRepublish every time this workbook is saved check box.