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Creating a saved data source as a .TDS file is advantageous primarily because it allows you to save the default field properties, such as number formats, calculated fields, and other metadata associated with the data. This is particularly helpful when you want to ensure consistency in how data fields are represented across different dashboards or workbooks.

By saving a .TDS file, you maintain the formatting and definitions you have set up, making it easy to reuse those attributes without needing to manually configure them again in a future workbook. This can enhance productivity and ensure that users have a uniform experience when working with the data.

Though other options address important concepts, they either focus on functionalities that are not specific to .TDS files or pertain to other types of files or data-sharing methods. For instance, sharing data is more directly managed through packaged workbooks or Tableau Server, while data blending is a process to combine data from different sources. Password protection of data sources typically relates to more secure connection files rather than the characteristics of a saved data source file.