I also note that the root partition on the drive which the failed boot
occurs changes from (hd7,2) to (hd6,2) when the usb back-up volume is
removed.

With USB:

menuentry "Arch ⁛ Linux (on /dev/sdh2)" --class gnu-linux --class gnu --class 
os {
        savedefault
        insmod part_msdos
        insmod ext2
        set root='(hd7,msdos1)'
        search --no-floppy --fs-uuid --set=root 
3b93366a-5715-4841-aa52-1567a9877fb9
        linux /vmlinuz-linux root=/dev/sda2 ro
        initrd /initramfs-linux.img
}

Without USB:

menuentry "Arch Linux (on /dev/sdg2)" --class gnu-linux --class gnu --class os {
        savedefault
        insmod part_msdos
        insmod ext2
        set root='(hd6,msdos1)'
        search --no-floppy --fs-uuid --set=root 
3b93366a-5715-4841-aa52-1567a9877fb9
        linux /vmlinuz-linux root=/dev/sda2 ro
        initrd /initramfs-linux.img
}

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https://bugs.launchpad.net/bugs/1017542

Title:
  grub2 update-grub puts wrong UUID in grub.cfg for system with separate
  /, /boot  partitions when detected by os-prober

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