Abstract: A method, a computer program product, and a computer system for transmitting a hierarchical data file from a first computer device to a second computer device. The first computer device receives a request for transmitting a first hierarchical data file. The first computer device modifies the first hierarchical data file based on a rule based filter. The first computer device receives from the second computer device a list of unique variables whose contents differ from contents in an existing file on the second computer device. The first computer device sends to the second computer device the contents of the unique variables. The contents of the unique variables are saved on the second computer device in a second hierarchical data file. The second hierarchical data file comprises pointers linking to contents of variables that are not the unique variables in the existing file.