from--https://www.mathstat.dal.ca/~selinger/ups/backups.htmlLinux and the APC Back-UPS ESWritten Oct 23, 2005. Updated Jan 5, 2007 Introduction I recently bought an APC Back-UPS ES 650 uninterruptible power supply (shown on the right). It connects to my computer via a USB cable (actually, via a special APC-supplied cable that has a standard USB connector on the computer en…