Embodiments of the present invention includes system and methods for the continued operation of a carrier management system having one or more user terminals that normally communicate with at least one data center over a network (online), when the one or more user terminals are unable to communicate with the data center (offline). Once communication is re-established between the one or more user terminal and the data center, local files and data on the user terminals that were used to rate and ship packages while offline are synchronized between the one or more user terminals and the data center.