For an analysis that is based on manually entered data, the changes that you make via the Reliability Distribution Data window will be saved for the analysis.
For an analysis that is based on a query or a dataset:
The query or dataset will not be modified with the updated data. Additionally, any record returned by the query will not be updated with your changes. The changes will be saved to the analysis only.
After you modify the data and save the analysis, the modified data will appear each time you open the analysis. If you want to revert to the original data, you can reload the original data to the analysis. In addition, if a query or dataset has changed in the database, you can reload the original data to the analysis in order for your analysis to contain those changes.