How to make a good clone of a Mirror RAID setup?

I have a Mac Mini Server running OS X Server (currently 10.6.8 but I'm in the process of upgrading to 10.8). The 2x500GB disk setup has been turned into two RAID-1 volumes: 400GB for OS X Server (disk2 = disk0s2 and disk0s1) and 100GB for a case sensitive volume that is mounted on /usr/local and which does not play a role in this story. I have a 400GB partition (/dev/disk4s2) on an external disk ready to receive the clone.
I want to make a good copy of the OS X Server disk. I was looking at several options:
dd - When running dd if=/dev/disk0s2 of=/dev/disk4s2, I can calculate that it will take 13 hours. Part of the reason for slow operation: both /disk4s2 and the boot disk for this operation are on the same external FW800 disk. dd if=/dev/disk2 of=/dev/disk4s2 is even slower.
ddrescue - interestingly tells me it needs to copy 9223 PBytes. I don't trust that so much so I stopped
Disk Utility - Select the / volume inside its RAID-1 entry and 'restore' it to a volume created by DU on /dev/disk4s2 (says it will do it in 2 hours, so is now running)
Disk Utility, create a read-only DMG on a volume on the partition reserved for it.
Use CCC (mainly rsync based) or SD commercial tools which operate on the file system level
I'm using the first DU option as that should give me a bootable setup in case of emergency. Did I miss a good option?

CCC would also give you a bootable copy and is the mothod I usually use, however I have also used the Disk Utility 'restore' method as well.

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