System for power management in a computer system, comprising: a first power source (102; 214; 302; 402), the uninterruptible power supply (UPS) (104; 212; 304; 404), which at a power failure of the first power source (102; 214; 302; 402) is operative deliver and send a power loss notification by one power; at least a second power source (106; 210; 218; 220; 306; 406); is connected (102; 214; 302; 402) to a utility power network (108;; 310,410) connected to the first power source and the second power source (406 106; 210, 218, 220,; 306); and a computer system having a plurality of portions (110; 204-208; 314-316; 414-416), each portion to the power supply network (108; 310; 410) and is effective to create an instance of an operating system (224, 228, execute 232); wherein one (204; 316; 416) portion of the computer system comprises a home maintenance structure (204) and the other portions (206-208; 314; 414) of the computer system, respectively a ...