I am dead tired of installing 3.1
You have a Deneb. You can boot from USB. You can boot from your backup.
And even if not, you could make a boot floppy with USB drivers which boots from your backup.
It's just a matter of putting the right files into the flash ROM or onto the floppy disk and to make a backup which can be booted (i.e. not an LhA archive or such, but a plain file copy).