FileVault hardens macOS by wrapping a layer of login protection around the part of the startup volume that holds your files and other data. With FileVault disabled, the data on that volume is effectively just one password away between an attacker and your files. That’s a dangerous situation if someone has physical access to your computer–in your home or office or because they’ve stolen it–they might be able to employ known and not-yet-discovered methods to bypass the login and
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