Turning off water, and unplugging machines
I never bothered doing either, you do more harm than good you wear out your faucet you wear out the electrical outlet, would you unplug your refrigerator and turn off the water to your icemaker and dishwasher, etc. when you leave?
That said if I leave my home for a number of days, I will shut off the main water supply, not so much for the appliances, but you can have a plumbing leak in an old larger home.
John