My machine is using Ubuntu 8.04 (=> legacy grub). It is backed up regularly and I would like to check I am able to restore the backup.
This backup includes everything on the system, including /boot (the only things excluded are things like /proc, /var, /dev...).
I "restored" the backup onto an external USB HDD, setup the boot flag there and I would like to boot that. Is that possible ?
I tried several variants of grub-install, changing the menu.lst, but still no luck. For one thing, the /boot/grub/device.map only shows the main HDD, not the USB HDD, is it ok to just add it in there? :
When I change the BIOS to boot from USB, it just seems to skip it.
What else do I need to do ?