A machine-implemented, network management method for managing a network of file servers where each file server has a data storage device for storing a plurality of data files and the respective data storage device of each file server contains a local catalog for describing each file currently stored in the respective data storage device at least by name and size, said method comprising the steps of:
- (a) collecting snapshots over time of the respective local catalogs of plural file servers of the network and storing said collected snapshots in a database memory so as to thereby create a historical database of collected snapshot information;
- and
- (b) automatically tracking changes across the historical database of snapshot information with respect to time.