Why do internet/ online servers need maintenance ?
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Think of it like a car, when you’re using it a lot (servers often work 24/7 all year, so they are used constantly), you’ll need from time to time to go to the garage and change the tires or maybe change the oil. Similar operations exist for servers, so when a piece of it is used, it has to be shut down to change it, like you cak’t drive a car when you change something on it (modern servers have now everything doubled so that you can change one without shutting down everything, that’s part of why google is never down). This doesn’t happen with our computer because we don’t use them all the time. Also, the progress in this sector are so fast that quite often you have to change your servers to stay competitive, again like with the car industry : car from the 70s is way worse on every point than one from the 2010s. It’s the same with servers, except the time scale is divided by 5 or 10.
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