This guide assumes you are using the Arch Linux LiveCD, and only have one hard drive, or are using a VM.
Please verify /dev/sdb is your USB key before performing any operations.

1) create partitions
	1. 128MB EFI (fat32)
	2. Linux
	3. Swap
	
2) Format partitions
	1. mkfs.vfat -F32 /dev/sdb1
	2. mkfs.ext4 /dev/sdb2
	3. mkswap /dev/sdb3

3) Mount Partitions
	1. mount /dev/sdb2 /mnt
	2. mkdir -p /mnt/boot/EFI
	3. mount /dev/sdb1 /mnt/boot/EFI
	4. swapon /dev/sdb3

4) Restore tarball
	1. tar -Jvpxf /backup/file.tar.xz -C /mnt

5) Chroot and update mount points
	1. genfstab -U -p /mnt > /mnt/etc/fstab
	2. arch-chroot /mnt /bin/bash
	3. grub-mkconfig >> /boot/grub/grub.cfg
	4. exit

6) Unmount partitions
	1. umount -R /mnt
	2. swapoff /dev/sdb3