This rule can be used in association with the Rollback to Step action, as it allows the system to repopulate the form data onto a previously saved form after changes have been made at the original step (following the Rollback to Step action). This option should only be used if the questions on the target step appear on another step within the process, and the questions have been set to pre-populate.
Although this rule action is related to the Rollback Candidates, it will need to be put on a new rule that sits above the Rollback Candidates rule.