make partition

parted /dev/sdc print
parted /dev/sdc rm 1
parted /dev/sdc mkpart primary ext4 1MiB 1GiB 
parted /dev/sdc mkpart primary ext4 1GiB 100% 
parted /dev/sdc set 1 boot on

make filesystem

mkfs -t ext4 -O ^has_journal /dev/sdc1
mkfs -t ext4 -O ^has_journal /dev/sdc2
dumpe2fs /dev/sdc1
dumpe2fs /dev/sdc2

copy files

apt-get install --no-install-recommends dump

mount -o noatime /dev/sdc2 /media/chroot
cd /media/chroot
dump -0 -f - /dev/vgsaturn/lvrootura | sudo restore -rf -

mount -o noatime /dev/sdc1 /media/chroot/boot
cd /media/chroot/boot
dump -0 -f - /dev/sdb1 | sudo restore -rf -

install grub

grub-install --boot-directory=/media/chroot/boot /dev/sdc
grub-mkconfig -o /media/chroot/boot/grub/grub.cfg