I have a magnetic emergency power switch. A couple of nights ago we had a pretty good storm blow through. I was cutting a project when the lights flickered 3 times. When the mag switch lost power it cut power to Shapeoko and router. The Shapeoko lost connection to laptop but more importantly the router was powered off. I was just starting cutout of a pushstick that was the last of 4 on a single board. Opened cc and disabled other tool paths and made new tp to cut out last part.
Without the mag switch I would have lost contact with Shapeoko but with power restored the router would have stayed where it was but would have began rotating.
Glad I installed the mag switch with emergency stop switch because I have used it a couple of times. You can hit pause but finding the pause button and the delay can be bad.
Come on, Guy, get you a UPS. If I was cutting the same 4 pushsticks, I would have just powered through the last one without stopping. The rest of the workshop would be dark, but my machine wouldn’t even know it. Has happened to me several times.
(That was a really bad storm, but we are far enough south of your area to have only registered an inch of rain. )