5 Easy Ways to Secure Your Mac
Secure your Mac files with FileVault
If your computer houses truly hush-hush information such as your financial records, you can scramble, or encrypt, the data in your Home folder (and only your Home folder) using an OS X feature known as FileVault.
Choose Security & Privacy under System Preferences and select the FileVault tab. Each user must enter their password. Apple automatically generates a recovery key you can use to unlock the vault. You can store this key with Apple, which will ask you to answer security questions (for example, What street did you live on when you were 9 years old?) to verify your identity.