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which APC UPS connects how on a NAS with only one PSU
When there is no budget for a rackmount NAS, then only one PSU is to be found on the back of a desktop model. What is the advantage of having two PSU's in parallel ? What is the difference ? In emergency situation, power drops anyway, so one needs to count on the UPS in both situations, not ?
Yes, having a dual PSU protects you from the power supply failure. This happens statistically often enough to consider it as a threat. It might take few days to get a replacement part.
So far NAS have several redundancy options:
-Multiple HDDs
-dual UPS
-dual motherboard/ controller board
-also dual NAS (high-availability option)

all this ensures uninterrupted service.

I hope this helps.

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