What is Data Synchronization?

Legal Definition
Data synchronization is the process of establishing consistency among data from a source to a target data storage and vice versa and the continuous harmonization of the data over time. It is fundamental to a wide variety of applications, including file synchronization and mobile device synchronization e.g., for PDAs. Synchronization can also be useful in encryption for synchronizing Public Key Servers.
-- Wikipedia
Legal Definition
Reconstructing or resequencing data to make sure its still got its integrity when restoration events occur. It is brought to the point before the moment of disruption. It need printed and/or electronic records to do this.