Looking for a UPS

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One option to consider is the CyberPower CP1000AVRLCD Intelligent LCD UPS. It has a higher power output of 600 watts and also includes an LCD screen that displays real-time information about the UPS status. It has 9 outlets, including 5 battery backup outlets and 4 surge protection outlets, and comes with both USB and serial connectivity options for easy integration with your DS920+.
PowerWalker UPS are usually cheap. You can find more info here https://nascompares.com/cheapest-ups-for...-qnap-nas/