APC 650V UPS Backup = $39.99 November 28, 2011 by Your Name in accessory, computers, deal APC 650VA Battery Back-Up System This battery back-up system features 8 surge-protected outlets to protect your computer and peripherals from power surges and spikes. The 340-joule rating absorbs a high quantity of energy for improved performance. Gives ample protection for one desktop. Great price.