A method and system for the simple, fast, and effective maintenance of consistent data files across a multiplicity of computer systems, which functionality is useful in collaborative work, effective backup, and disaster recovery. Consistency is maintained using secure file storage remote from any number of clients the files on which are automatically synchronized consuming minimal network bandwidth. Automated bi-directional "one-click" synchronization is implemented via a method that is neutral with respect to platform, operating system, firewall, and network configuration. The software product based on the invented method has the substantial advantage of installation, setup, and operation all without intervention by system administrators.