Encrypting the hard drive on your personal computer
IMPORTANT: You must back up all your data to a separate storage device or location BEFORE encrypting your hard drive. You must also save the encryption key on a separate storage device or location, and print out a copy. Store the key and the printout at room temperature, and somewhere relatively dry and secure such as a locked drawer or safe.
- Microsoft support: https://support.microsoft.com/en-us/help/4028713/windows-10-turn-on-device-encryption
- Apple support: https://support.apple.com/en-us/HT204837