it works!

main.sh

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+#prepare
+##check for root
+if [ `id -u` != 0 ] ; then 
+    echo "==> Need to be root"
+    exit 1
+fi
+##check for network
+ping -c 1 192.168.100.16 &> /dev/null
+if [ "$?" != 0 ]
+then
+  echo "==> Host unavailable, exiting"
+  exit 1
+fi
+
+##check for space
+
+rsync_dir_list=($(rsync --password-file=/home/losted/.rsync_pass rsync://rsync@192.168.100.16/rsync/ | awk '{print $5}' | grep -v .DS_Store | grep -v "@Recently-Snapshot" | sort -r | head -n -1))
+
+swapSize=$(free -m | grep "Mem" | awk '{print $2}')
+let "swapSize += 512"
+swapSize=$swapSize"M"
+bootSize=256M
+
+#begin
+
+##chose backup
+
+echo "==>" ${#rsync_dir_list[@]} backups: ${rsync_dir_list[@]}
+read -p "Input backup number:" backupNum
+let "backupNum -= 1"
+
+##set target drive
+lsblk -o NAME,LABEL,FSTYPE,SIZE,MOUNTPOINT,MODEL
+read -p "Target drive is " targetDrive
+
+targetDrive=/dev/$targetDrive
+
+echo deployin\' ${rsync_dir_list[$backupNum]} on $targetDrive in 15s...
+
+sleep 15
+
+##clear mbr for sure
+
+dd if=/dev/zero of=$targetDrive count=512
+
+##fdisk
+echo "==> fdisk is working..."
+(
+echo o # Create a new empty DOS partition table
+echo n # Add a new partition
+echo # Primary partition
+echo # Partition number
+echo # First sector (Accept default: 1)
+echo +$swapSize  # Last sector (Accept default: varies)
+echo y #remove sign
+echo n
+echo
+echo
+echo
+echo +$bootSize
+echo y
+echo n
+echo
+echo
+echo
+echo
+echo w
+) | fdisk $targetDrive
+    # IMHO this ^ is less obfuscated way
+
+##mkfs's
+echo "==> Making filesystems..."
+echo "mkswap"
+mkswap $targetDrive"1"
+echo "mkfs.vfat"
+mkfs.vfat $targetDrive"2"
+echo "mkfs.ext4"
+mkfs.ext4 $targetDrive"3"
+
+##get disk's uuid
+echo "==> Got UUIDs!"
+UUIDS=($(blkid $targetDrive"1" $targetDrive"2" $targetDrive"3" -o value -s UUID))
+
+##mount disks
+echo "==> Mounting..."
+mount $targetDrive"3" /mnt
+mkdir /mnt/boot
+mount $targetDrive"2" /mnt/boot
+
+##rsync
+echo "==> Copying from NAS..."
+rsync --archive -P --password-file=/home/losted/.rsync_pass rsync://rsync@192.168.100.16/rsync/${rsync_dir_list[$backupNum]}/ /mnt/
+
+##update fstab
+echo "==> Updating fstab..."
+rm /mnt/etc/fstab.orig
+mv /mnt/etc/fstab /mnt/etc/fstab.orig
+cat /mnt/etc/fstab.orig | grep "ext4" | sed 's/UUID=[A-Fa-f0-9-]*/UUID='${UUIDS[2]}'/' > /mnt/etc/fstab
+cat /mnt/etc/fstab.orig | grep "vfat" | sed 's/UUID=[A-Fa-f0-9-]*/UUID='${UUIDS[1]}'/' >> /mnt/etc/fstab
+cat /mnt/etc/fstab.orig | grep "swap" | sed 's/UUID=[A-Fa-f0-9-]*/UUID='${UUIDS[0]}'/' >> /mnt/etc/fstab
+rm /mnt/etc/fstab.orig
+
+echo "==> Result:"
+cat /mnt/etc/fstab
+##update grub linux options
+
+cat /mnt/etc/default/grub | sed 's/cryptdevice=UUID=[A-Fa-f0-9-]*:cryptroot //' > /mnt/etc/default/grub #remove cryptdevice, no encrypted fs today :c
+
+cat /mnt/etc/default/grub | sed 's/resume=UUID=[A-Fa-f0-9-]*/resume=UUID='${UUIDS[0]}'/' > /mnt/etc/default/grub
+
+##mount system stuff
+echo "==> Mounting /dev, /sys, /proc..."
+mount /dev /mnt/dev --bind
+mount /sys /mnt/sys --bind
+mount /proc /mnt/proc --bind
+
+##chroot, mkinitcpio and update grub
+echo "==> mkinitcpio and update grub..."
+
+#cat /mnt/etc/mkinitcpio.conf | sed 's/encrypt //' > /mnt/etc/mkinitcpio.conf #remove cryptdevice, no encrypted fs today :c
+
+#chroot env
+cat << EOF | chroot /mnt
+mkinitcpio -P
+grub-mkconfig -o /boot/grub/grub.cfg
+grub-install $targetDrive
+exit
+EOF
+
+#deinit
+echo "==> Syncing..."
+sync
+echo "==> Unmounting..."
+umount -R /mnt
+echo "==> Done!"