This is a manual to boot the restore CD from your network (PXE).

Prerequisites:

PXELinux (See http://www.syslinux.org/wiki/index.php/PXELINUX )
TFTP Server (See "TFTP servers" section in http://www.syslinux.org/wiki/index.php/PXELINUX e.g. http://tftpd32.jounin.net/tftpd32_download.html for Windows) or HTTP server
Downloaded UrBackup Live Restore ISO image

Steps:

Setup a TFTP server with appropriate DHCP server (see above PXELinux manual)
Unzip the UrBackup-Live-Restore ISO in a directory called urbackup (using e.g. 7zip)
Edit your pxelinux.cfg/default file as below (replace the ip address of the server) :

LABEL UrBackup Restore
kernel urbackup/live/vmlinuz
append initrd=urbackup/live/initrd.img boot=live config username=urbackup toram noswap fetch=tftp://xxx.xxx.xxx.xxx/urbackup/live/filesystem.squashfs

With UrBackup Restore 1.1.1 you can also use hostnames and load the filesystem from a HTTP server:

LABEL UrBackup Restore
kernel urbackup/live/vmlinuz
append initrd=urbackup/live/initrd.img boot=live config username=urbackup toram noswap fetch=http://SERVERNAME/urbackup/live/filesystem.squashfs

Boot your client via PXE and the restore should run.

Restoring Images from PXE