Desktop computer system been DIY (assembled) or Branded has become sine-qua-non compare to other tools in business organizations like banks and schools. This desktop computer requires clean electricity power to operate. Supply of clean and un-interrupted electricity power is compulsory to keep computer running and also for maintains and preventing of components like HDD, RAM, and other electronics components and circuitry from damage and hazard. This gives the reasons why UPS is recommended for every desktop computer. This UPS comes as separate device connect to power source and computer system then connect to it for power source. The focus of this research work is to clone a PC (desktop) with in-built UPS. The work starts with case and power packs modification to accommodate the UPS and it circuitry system and the system is clone and tested to ascertain that it achieved the research aim and objectives.