I realize now that they removed the Backup option from the Linux Rescue on recent versions...
You need to use the Windows version, if it can't access the HDD then we have to find the correct driver to add...
The option you need to use is Backup and not Clone, only the Backup option allow the creation of an disk image to the external disk.
I used the Windows version to try and create the backup but System Backup is unavailable. Step1 "Select the partitions or volumes you need to backup." is grayed out and not selectable. It says "The program does not find the system partition."
Disc Backup lists only the USB flash stick in Step1 "Select the disks you need to backup."
Partition Backup shows the USB flash stick as Basic MBR H:. My HDD is shown as Dynamic with J: partition at 450GB and K: partition at 15.27GB and two partitions marked with * just like on the Linux version of the program. None of the HDD partitions are selectable.
File Backup is useless as the contents of my HDD aren't listed.