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10.7: Enable Time Machine encryption on Lion
Authored by: Lycestra on Jul 22, '11 11:12:57AM

Small updates:
Yes, this does require a physical connection to the device, so network disks won't work.
My 1TB drive just finished "converting" (encrypting) the drive (~24 hours). When I rebooted the machine for another purpose, it did ask for the password when I logged in, and if i wanted to store it on my keychain.

Some nitty gritty details for the really geeky, you can see details at the command line using 'diskutil coreStorage list'. All old drives won't show up since they don't use it. The encryption layer, which is used by FileVault2, is implemented with Lion's new Core Storage, which is a Logical Volume system to you Linux types. Simply put, it adds encryption between the hardware and the filesystem, so the filesystem itself is unmodified, just filtered thru encryption. You could use the command line interface to convert any qualified drive, but I won't provide details here (mostly because I don't know them). Another day. This would probably be most useful to users who have multiple drives, and want to encrypt more than just the boot drive without reformatting. (Disk Utility in Lion allows you to format HFS drives encrypted now too)

If I can add a speculation, Core Storage may have come out of Apple's efforts with ZFS. The song and dance of setting up logical volumes and such with community betas seemed to have similar components, but more complicated (read: unpolished) steps to construct. Again, speculation. It's a modern API addition none the less, so it probably shouldn't be construed as momentum in that direction, just that steps have been taken to improve Apple's offering.

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