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Do I need to turn off my UPS when I power off my PC?

Or, put differently, is it okay for the UPS to be turned on all the time?

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It is OK for the UPS to be on the whole time.

In fact, your UPS will last longer and be more reliable if it is not shut off regularly. (Especially if the UPS has a small deep cell battery.)
[There is a limit to the number of recharges a battery can accept, and it takes time to charge the battery each time it is plugged in.]

An extremely minute amount of electricity will be consumed by the UPS - no differently than the battery of a laptop if it is always left plugged in.

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Welcome to SuperUser. You should follow the recommendations of the UPS manufacturer, but I am giving you this answer from my experience.

It is OK to leave the UPS on all the time. This will ensure the battery is kept fully charged in case you need it. Otherwise, it will only charge when you turn it on and if you have a power outage, you may not have the full time on the UPS.

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