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#11
Summer is when I have the most "dirty" power (low voltage events) due to increased AC usage. My UPS will regulate that directly from the mains without having to use the battery.
I run my computer 24/7, except for occasional shutdowns when something goes pear shaped or, mostly, when installing programs or updates, since I often have updates downloading or backups uploading overnight. I normally shut the computer down when I go out of town but I trust my UPS enough (yes, I've tested it), I had no worries leaving it running during a recent trip because I had a large amount of data that needed to uploaded to Carbonite (it was throttled when I exceeded 200GB online).
I don't understand why you are concerned about the keyboard power. Once the power comes back on, wouldn't the keyboard's PSU power it back up?