A system for making automatic backup copies of files when a personal computer is switched off, comprises at least one personal computer, an internal or external storage unit, a principal power relay and configurable control software. The replication is initiated when an original data object in a source data store that is capable of being both read from and being written to is read. The connection strip extends along a connection path from the mounting base of one of the electrical contacts to the mounting base of the other electrical contact. Based on the determination result, a request for starting communication with the counterpart transmission terminal is accepted or rejected. A controller is coupled to the energy source, the bus, and the contactors.