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10.5: How to use Time Machine with FileVault
Locking the screen, instead of logging out, neither allows backup nor leaves the user's home directory protected. While the screen is locked, the user's home directory is still mounted as an unencrypted volume under "/Users." It can be accessed by either entering an admin username/password in the unlock screen or through some back door with admin or root privilege.
10.5: How to use Time Machine with FileVault
Users who use FileVault must learn to log out regularly if they want any security. This is hyperbole. FileVault gives you more security than not, and being logged out gives you more security than being logged in. The habit of logging out does not increase your security for those moments when you're logged in. Your files would be more secure if you encased your laptop in a 12' thick concrete block and sank it in the South Pacific, but you wouldn't be able to work with them. Time Machine's behavior with FileVault is neither transparent nor fully automatic, and requires changes in behavior for many if not most laptop users. This is pretty ironic for two systems whose goals included security without changes in behavior. |
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