A method for validating data in a copy repository is disclosed. In one embodiment, such a method includes establishing a template that designates valid fields within a data set, as well as valid values and types of data within the fields. The method further establishes a timeframe over which to validate versions of the data set residing in a copy repository. Starting at a first end of the timeframe and proceeding to a second end, the method validates each version of the data set residing in the copy repository. To accomplish this, the method configures a computing system to a state that existed when the version was created in the copy repository. The method then opens the version on the computing system and validates the version against the template. A corresponding system and computer program product are also disclosed.