Both Windows and Mac computers include a free way to encrypt your entire storage drive. You should turn it on, if you haven't already. https://ssd.eff.org/module/how-encrypt-your-windows-device
Worth adding here that the vast majority, if not all, Linux distributions have built in storage encryption, will run very well on older hardware (even some old Chromebooks) and the entire operating system comes to the user free of cost and free of surveillance.
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