If you have a serious home office, then you should have serious protection for your computers and other critical hardware. The above are examples of uninterruptible power supply (UPS) devices made by the industry leader American Power Conversion (APC). A UPS will protect your data and machines from damage or loss caused by power blackouts and brownouts. I recommend APC because the two that I own have worked extremely well, i.e. they have protected my home office machines during major and minor brownouts, and all blackouts.