found a very fine tutorial, which also works for debian (wheezy)

http://www.geekyprojects.com/cloning/setup-a-clonezilla-server-on-ubuntu/

i modified it a little to adapt it to debian, you can download it as pdf from here: Setup a Clonezilla Server on Debian – Ubuntu.pdf

(tested on Linux clonezilla 3.2.0-4-686-pae #1 SMP Debian 3.2.60-1+deb7u3 i686 GNU/Linux)

here are the server startup/shutdown/deployment scripts:

CloneZillaServerScripts_v1.tar.gz

here is a example output of the clonezilla server

root@clonezilla:/scripts# /scripts/StartCloneZillaServerWithMenu.sh
starting dhcp server
Internet Systems Consortium DHCP Server 4.2.2
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Wrote 0 class decls to leases file.
Wrote 2 leases to leases file.

No subnet declaration for start (no IPv4 addresses).
** Ignoring requests on start.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface start is attached. **


Not configured to listen on any interfaces!
starting clonezilla server in choose select_in_client mode
Setting the TERM as xterm
*****************************************************.
*****************************************************.
Clean all the previous saved config file if they exist...done!
Client OS type when doing Clonezilla job is: nfsroot
Starting the OCS service for node IP add. = 192.168.3.2
Starting the OCS service for node IP add. = 192.168.3.3
Starting the OCS service for node IP add. = 192.168.3.4
Starting the OCS service for node IP add. = 192.168.3.5
Starting the OCS service for node IP add. = 192.168.3.6
Starting the OCS service for node IP add. = 192.168.3.7
Starting the OCS service for node IP add. = 192.168.3.8
Starting the OCS service for node IP add. = 192.168.3.9
Starting the OCS service for node IP add. = 192.168.3.10
Starting the OCS service for node IP add. = 192.168.3.11
Starting the OCS service for node IP add. = 192.168.3.12
Starting the OCS service for node IP add. = 192.168.3.13
Setting the PXE clients to DRBL mode with label "Clonezilla: choose save or restore later"...
Turn off all MENU DEFAULT in /tftpboot/nbi_img/pxelinux.cfg/default...
Make "clonezilla" as default label in /tftpboot/nbi_img/pxelinux.cfg/default.
The MENU LABEL is "Clonezilla: choose save or restore later"
Client jobs are recorded in this file: '/var/log/clonezilla/clonezilla-jobs.log',
*****************************************************.
Now set the client machines to boot from PXE or Etherboot (refer to http://drbl.org for more details). Then boot those clients and you can choose to save or restore an image!
NOTE! (1) If the cloned OS is MS windows, and it fails to boot with an error message like "Missing Operating System" or "Invalid System Disk", then you can try to (1) change the IDE hard drive settings in the BIOS to use LBA mode instead of AUTO mode. (2) Or you can try to use parameter -t1 when restoring.
Client 192.168.3.4 (00:10:f3:36:7e:60) finished cloning. Stats: Saved /images, /dev/sda1, success, 5.8 GB = 1407632 Blocks, 7.373 mins;
admin