Rsync with SystemRescueCD

Using the SystemRescueCD:

mkdir /mnt/usb
mkdir /mnt/Data

Mount the NTFS USB disk
ntfs-3g /dev/sdc1 /mnt/usb

Mount the UFS disk
mount -t ufs -o ufstype=ufs2,ro /dev/sda1 /mnt/Data

then use grsync to copy the data

Source: /mnt/Data
Destination: /mnt/usb
This will copy the Data folder and its subdirectories to the mounted USB drive.