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Full disk encryption | Surveillance Self-Defense
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Surveillance
Self-Defense
Self-Defense
Full disk encryption
If you're planning on securing data 
on your local device, you could choose to just encrypt a few important files, or you could encrypt everything on the computer. “Full disk encryption” is the term for encrypting everything. It's usually safer (and often easier) to use full disk encryption than to manage just a few individually encrypted files. If you encrypt individual files, your computer might make temporary unencrypted copies of those files without you noticing. And some software might keep some unencrypted records about your use of your computer. Apple's macOS, Linux, and some versions of Windows all have built-in full disk encryption, but it is usually not turned on by default.