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Using back promotions serves the critical purpose of propagating a hotfix. When a hotfix is developed to resolve a specific issue in a production environment, it is essential to ensure that this fix is not only applied to the current version but also integrated into earlier versions where the problem may still exist. By utilizing a back promotion, the hotfix can be efficiently applied to those earlier versions, thereby maintaining consistency across environments and preventing the same issue from affecting other users.

In contrast, the other options address different aspects of deployment and change management. While applying ongoing changes across the organization is important for a stable rollout of features, it is not the primary purpose of a back promotion. Improving data storage efficiency relates to overall system performance and architecture rather than to the direct action of propagating hotfixes. Lastly, simplifying user permissions is more related to access control and security management rather than the specific necessity of addressing issues that a hotfix targets. Thus, the most fitting reason within the provided context for implementing a back promotion is to ensure that critical fixes are consistently applied across different versions of the application.