Mark, Gwalk900 listed some great things on how to watch your data usage. The Glasswire program is especially effective if you find yourself in a situation where you seem to be using more data than you think you should be. It breaks your data usage down so you can see exactly what, on the computer it's installed on, is using it. But, as stated, it only monitors the data usage on the computer it's installed on, so if you have additional devices, like a smart phone or something else, it doesn't monitor that. If you have Windows 10, make sure that you have syncing turned off. Also make sure that in your Windows update settings, you have the option to "update from more than one place" turned off. It's also best to not use the cloud. Those three things can use a lot of data, especially the last two. Also, if your computer is used wirelessly, like a laptop using a wireless router, you can have it set as a metered connection. That way you can control when your Windows updates are downloaded. Really, anything that you can do to use less data is great, and having things that can use a lot of data either turned off or set to manual is the best way to save on that data. As for watching your data regularly, I find that the Hughesnet Status Meter is the easiest and fastest way to do so. It gives you a quick look at how much data you've used and how much you have left of your monthly data allowance.
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