I have a two-disk system with GPT tables with some partitions in RAID1 with 
mdadm and root in LVM with RAID (ie. lvcreate --type raid1 ...) and a mix of 
ext2 and ext4. I'd like to backup to another two-disk set on the same system.

Can ddrescue deal with RAID, LVM and the bootloader?

I'm guessing running the following is not enough:

# sgdisk -R=$targetDev $sourceDev
# ddrescue --force -n $sourceDev $targetDev /tmp/ddrescue-clone



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