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Say I have drive A that is already encrypted with Filevault2. I want to make an exact clone of the drive to a different drive B. Every way I've tried so far decrypts drive A first, then clones, resulting in drive B being decrypted when the clone completes. Is there a better way to clone drive A bit for bit? I'm thinking of using dd but was wondering if there was a more Apple friendly way.

The best way I've been able to figure out how to do this so far:

  1. Boot to a Lion install USB drive.
  2. Open Disk Utility & unlock the encrypted drive
  3. Format the new drive
  4. Restore the encrypted volume on your new drive. It will be unencrypted.
  5. Close disk utility & open Terminal.
  6. In Terminal, type "diskutil cs convert /Volumes/Macintosh\ HD/".
  7. Boot up to the new drive, open System Preferences, & re-enable encryption. All previous settings should still be there.

I have not fully tested this method, but in theory it should work. It's too many steps for my liking though. I'd prefer one clone & be done with it, somehow.

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"Every way I've tried" would be what exactly? There is no reason in having people here proposing solutions you've already tried... – patrix Nov 29 '11 at 19:01
The standard battery of methods: Disk Utility w/ it's default options enabled, Carbon Copy Cloner, SuperDuper. – churnd Nov 30 '11 at 11:53

You could use the recovery option of Disk Utility:

enter image description here

This of course requires source and target disk to be identical, but the same restriction applies to dd and similar tools.

Usual warnings concerning picking the right disk as source etc. apply!

share|improve this answer
Assume the destination disk is smaller. Is that a problem for this method? – churnd Nov 30 '11 at 11:53
Yes, as with dd etc. – patrix Nov 30 '11 at 12:56

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