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To protect my Raspberry Pi server against sudden power outage and power fluctuations I've decided to install an "Uninterruptable Power Supply", or "UPS". I got the [APC Back-UPS 2200VA, 230V, AVR, 4 Schuko outlets](https://www.apc.com/shop/ug/en/products/APC-Back-UPS-2200VA-230V-AVR-4-Schuko-outlets/P-BX2200MI-GR) that gives my raspberry pi a window of about 1 hour to properly shut down without...