does data destruction extend to the destruction of redundancy (backup) data? What if they are not identical? Created at different times, storing different data set, etc means that SOME of the backup...

does data destruction extend to the destruction of redundancy (backup) data? What if they are not identical? Created at different times, storing different data set, etc means that SOME of the backup data could be somewhat different from the original data...must redundancies be destroyed at the same time as originals?

C++ PROGRAMMING