Abstract: Systems, apparatus, and methods are disclosed for using a deduplication index, a centralized cache repository, and a data mapping mechanism to detect and synchronize changes to deduplicated data objects stored in two or more third party databases. The disclosed systems, apparatus, and methods can maintain, in a deduplication index, a two-way mapping between one or more data object references and a datagram which uniquely identifies the real-world entity represented by said data object; maintain, in the centralized cache repository, two temporal states, one including current information, the other including previously-synchronized information. The disclosed systems, apparatus, and methods can also implement the data mapping mechanism to determine corresponding data objects in other systems when one or more data objects have apparent changes when compared with the centralized cache repository, and apply a given configuration in order to synchronize the current temporal states of all such data objects.