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The surge protector will protect against power surges only. A UPS will not only protect against power surges but will provide power to the router even during a power outage.
If you also connect your modem into the UPS & use notebook computers a UPS will protect you 3 ways.
1. You can download any size file without worry of being interrupted.
2. A power outage during a firmware upgrade will not result in a bricked router.
3. Protects against power surges while filtering & conditioning line voltage.
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