I copied a backup of my entire VPS (Debian on OpenVZ) on a USB drive, and want to boot from this USB to test something on my server (in fact its duplicate). However, there is no nothing in the boot directory (I've no idea how OpenVZ boots the OS). How can I make the USB bootable?
Do I need to install
GRUB on the USB? If yes, how can I do this NOT to affect the
GRUB on my HDD (my main computer). I do not want to make a dual boot, it is just temporary booting from USB.