A UPS like the APC Back-UPS BE600M1 has to be able to power your equipment for an acceptable amount of time to be worth installing. I tested one for a couple weeks with my networking equipment to see how well it performs in real-world conditions.
APC BE600M1 Back-UPS 600 VA 330 Watts Power Supply (UPS)
APC UPS: 450W 120V BR700G for sale online
APC Back-UPS BE600M1 Review: Efficient Battery Backup With a Built-in USB Charger
APC Back-UPS BE600M1 Review: Efficient Battery Backup With a Built-in USB Charger
APC Back-UPS Pro Gaming 1500VA UPS, 10 Outlets, Arctic (BGM1500)
APC by Schneider Electric Back-UPS 600VA Tower UPS - BE600M1 - UPS Battery Backups
APC UPS Battery Backup & Surge Protector with USB Charger, 600VA APC Back- UPS (BE600M1)
APC Back-UPS 600VA UPS Battery Backup (BE600M1)
Uninterruptible power supply (UPS) with 600VA / 330W battery backup power 7 Outlets (NEMA 5-15R): 5 Battery Backup & Surge Protector; 2 Outlets with
APC UPS Battery Backup and Surge Protector, 600VA Backup Battery Power Supply, BE600M1 Back-UPS with USB Charger Port
Stay connected for hours, not minutes. Charge and power more than one device at once. Wider outlet spacing for both high and low power devices.
APC by Schneider Electric Back-UPS 600VA Tower Ups
A Guide to Choosing the Right UPS for Your Synology or QNAP NAS Drive – NAS Compares
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APC Back-UPS 600VA UPS Battery Backup (BE600M1)
APC UPS 1000VA Sine Wave UPS Battery Backup and Surge Protector, BR1000MS Backup Battery Power Supply with AVR, (2) USB Charger Ports : Electronics