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

[Enquiries]

After Russian missile attacks on the Ukrainian power infrastructure, we have ROLLING BLACKOUTS (the power is turned on and off every 4 hours).
I need a low-budget UPS that would ALERT my Synology DS220+ (USB/LAN) and supply enough power for a safe shutdown.
NAS would be the only device connected to the UPS. I won't need access to the NAS during a power outage. All I need is a safe NAS shutdown.
DS220+ PSU is rated as 60W (12V 5A).

BTW, if there are some decent UPS devices with 12 volt DC output, that works for me, too.
Synology would be the only device, so there's no need to convert 230V (mains) to 12V (UPS battery), then back to 230V (UPS out) and back to 12V (Synology input)

To sum up:
- UPS for Synology DS220+ safe automatic shutdown
- output: 230V or DC 12V
- consumption: 60W for 10 min shutdown (max)
Extra:
- power switch (preventing unnecessary NAS start-ups)

[ed]

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