Cloning OS X encrypted drive
Just to rectify one thing: disk1 is not the encrypted data. Disk1 is a mounted "virtual" volume with its own disk identifier. This volume is unlocked and as such unencrypted if you are a legitimate user. It's based on inferior encrypted data structures residing in disk0s2.

To clone (and subsequently decrypt) FileVault2 volumes successfully three objects/data structures are important:


Superior LVM structures in disk0s2 (the CoreStorage Volume Group)
The Recovery HD partition. It contains some intermediate keys which are necessary to extract the final keys to unlock the FileVault2 volume.
The encrypted data itself


To clone a FileVault2 volume you may either dd the CoreStorage LVG and the Recovery HD or copy the unlocked FileVault2 volume to a second volume with rsync or Disk Utility/a disk cloner like Carbon Copy Cloner.

dd:


Open Terminal and enter diskutil list.
Enter sudo gpt -r -vv show /dev/diskX with diskX: the disk with the CoreStorage LVG containing the FileVault2 Logical Family/Volume
Now attach a second (external) disk (diskY) and replicate the GUID partition table of the source (diskX) to the target disk (size, type etc.) with gpt.
Recheck the identity of the GUID partition table of diskX and diskY
Enter:
dd if=/dev/rdiskXs1 of=/dev/rdiskYs1 to copy the EFI partition
dd if=/dev/rdiskXs2 of=/dev/rdiskYs2 to copy the CoreStorage LVG
dd if=/dev/rdiskXs3 of=/dev/rdiskYs3 to copy the Recovery HD
done


Disk Cloner

This will not create an identical disk (same intermediate/final keys etc.) but a volume containing identical data.


Boot to a Recovery HD, an installer thumb drive or a second full-blown OS X volume.
Enter the unlock key of the FileVault2 volume while booting.
Attach the external disk and create a sufficiently dimensioned normal volume with an appropriate tool.
Open Disk Utility (or Carbon Copy Cloner if use a full OS X system)
Restore the source volume (the unlocked FileVault2 volume) to the destination disk.
Reboot to the external drive.
Open System Preferences -> Security and enable FileVault.