The functionality of a UPS consists in providing auxiliary power for the purpose of preserving precious data. With a laser printer, in the event of a mishap in the electrical supply, the printing tasks remain queued in the print spool and are naturally recovered once the mishap is gone.
Nevertheless, for large printing cycles involving publishing houses, graphics and copiers in general, it is best to protect the data in order to cushion the large data transmission time to the printer memory.
