Clonezilla back up / restore by machine number

Boot menu: "Clonezilla: back up this PC" and "restore this PC" ask for the
machine number and boot Clonezilla (64-bit with Debian shim, or 32-bit
i686 by cpuid) with ocs_repository=smb3://clonezilla:<pw>@server/clonezilla/,
ocs_prerun fetching clonezilla-scripts/pxe-cz.sh and ocs_live_run running
it. The script validates the machine number, saves
<machine>-<YYYY-MM-DD-HHMM> (server time), writes pxe-meta.txt, runs
ocs-chkimg, and restores only that machine's images with -k1 -r after a
typed YES. The old entry is "Clonezilla: manual".

Playbook: clonezilla Samba user for the [clonezilla] share only, password
from clonezilla_smb_password (validated, filled into the menu
placeholder), scripts installed to the web root.

Webapp: Clonezilla backups page lists image folders and zips grouped by
machine number with serial/model/version/check, serial mismatch flag,
delete, move to another machine, streamed tar download, disk space bar
and an explicit keep-last-N retention with preview. Tests and a VM test
plan added.

playbook/ipxe/GetPxeScript.aspx

@@ -10,8 +10,10 @@ item --gap --             ---- Drive Erase ----
 item blancco              Blancco Drive Eraser
 item blancco_debug        Blancco Drive Eraser (debug / SSH)
 item --gap --             ---- Utilities ----
-item clonezilla           Clonezilla Live (Disk Imaging)
-item clonezilla32         Clonezilla Live 32-bit (XP-era PCs, forced)
+item cz_backup            Clonezilla: back up this PC
+item cz_restore           Clonezilla: restore this PC
+item clonezilla           Clonezilla: manual (USB or other location)
+item clonezilla32         Clonezilla: manual, 32-bit (XP-era PCs, forced)
 item --gap --             Memory test: Dell PCs press F12 at power-on, Diagnostics
 item --gap --             ----
 item reboot               Reboot
@@ -48,6 +50,47 @@ echo Windows PE boot FAILED (see the error above).
 echo Check that the PXE server is up and the win11 boot files are staged.
 prompt Press any key to return to menu... && goto menu || goto menu
 
+# --- Clonezilla by machine number (back up / restore) ---------------------
+# The image share is \\${server}\clonezilla (Samba account clonezilla,
+# the playbook fills in its password). Clonezilla mounts it on
+# /home/partimag (ocs_repository, SMB 3), downloads
+# clonezilla-scripts/pxe-cz.sh (ocs_prerun) and runs it (ocs_live_run):
+# it checks the machine number, saves <machine>-<YYYY-MM-DD-HHMM> or lists
+# that machine's images to restore, and writes pxe-meta.txt.
+:cz_backup
+set cz_mode save
+goto cz_machine
+
+:cz_restore
+set cz_mode restore
+goto cz_machine
+
+:cz_machine
+# iPXE cannot check characters: pxe-cz.sh accepts letters, digits and dash
+# and asks again there. Empty: ask again. Esc / Ctrl-C: back to the menu.
+echo
+echo -n Machine number: && read czmachine || goto menu
+isset ${czmachine} || goto cz_machine
+# Same CPU check as the manual entry below (cpuid --ext 29 = 64-bit).
+cpuid --ext 29 && goto cz_auto64 || goto cz_auto32
+
+:cz_auto64
+set base http://${server}/clonezilla
+kernel ${base}/vmlinuz boot=live username=user union=overlay config components noswap edd=on nomodeset nodmraid locales=en_US.UTF-8 keyboard-layouts=us ocs_prerun="wget -q -T 15 -t 5 -O /tmp/pxe-cz.sh http://${server}/clonezilla-scripts/pxe-cz.sh" ocs_repository="smb3://clonezilla:__CLONEZILLA_SMB_PASSWORD__@${server}/clonezilla/" echo_ocs_repository=no ocs_live_run="bash /tmp/pxe-cz.sh" ocs_live_extra_param="" ocs_live_batch=no net.ifnames=0 nosplash noprompt fetch=${base}/filesystem.squashfs pxe_cz_mode=${cz_mode} pxe_machine=${czmachine} pxe_end=1 || goto secureboot_warn
+initrd ${base}/initrd.img || goto boot_failed
+# Secure Boot ON: Debian's shim, as in :clonezilla64 below.
+shim ${base}/shimx64.efi ||
+boot || goto secureboot_warn
+
+:cz_auto32
+# 3.2.0-5 i686 over legacy BIOS only; UEFI goes to the 64-bit build.
+iseq ${platform} efi && goto cz_auto64 ||
+set base http://${server}/clonezilla-i686
+kernel ${base}/vmlinuz boot=live username=user union=overlay config components noswap edd=on nomodeset nodmraid locales=en_US.UTF-8 keyboard-layouts=us ocs_prerun="wget -q -T 15 -t 5 -O /tmp/pxe-cz.sh http://${server}/clonezilla-scripts/pxe-cz.sh" ocs_repository="smb3://clonezilla:__CLONEZILLA_SMB_PASSWORD__@${server}/clonezilla/" echo_ocs_repository=no ocs_live_run="bash /tmp/pxe-cz.sh" ocs_live_extra_param="" ocs_live_batch=no net.ifnames=0 nosplash noprompt fetch=${base}/filesystem.squashfs pxe_cz_mode=${cz_mode} pxe_machine=${czmachine} pxe_end=1 || goto boot_failed
+initrd ${base}/initrd.img || goto boot_failed
+boot || goto boot_failed
+
+# --- Clonezilla manual (interactive: USB, SSH, NFS or any share) ------------
 :clonezilla
 # 64-bit CPUs (cpuid extended bit 29 = long mode) get the current Clonezilla;
 # older 32-bit-only CPUs (Pentium 4 without EM64T, Pentium M, early Atom: