Low-cost UPS for Synology DS220+ 2 bay (no other devices connected)

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If you only need 10 minutes for shutting the NAS down automatically, you can go for PowerWalker Basic VI 600 STL UPS. USB connection will communicate with a NAS. More info here https://nascompares.com/cheapest-ups-for...-qnap-nas/

Also you can use this calculator https://www.apc.com/shop/uk/en/tools/ups...=PRICE_ASC

And then get a cheaper UPS based on report