diff --git a/.config/guix/system/default.scm b/.config/guix/system/default.scm
index eb4ed44d..487dc185 100644
--- a/.config/guix/system/default.scm
+++ b/.config/guix/system/default.scm
@@ -90,14 +90,14 @@ StrictNodes 1")
          ;; exfat-utils        ; TODO: Needed for macOS drives?  Does not seem to work.
          fuse-exfat
          emacs-exwm
-         vhba-module
+         vhba-module        ; For CDEmu.
          %base-packages))
 
 (define-public %ambrevar/firmware
   (append ;; (list vhba-module) ; TODO: Useless?
    %base-firmware))
 
-(define-public default-operating-system
+(define-public %ambrevar/default-os
   (operating-system
     (host-name "ambrevar-system")
     (timezone "Europe/Paris")
diff --git a/.config/guix/system/desktop-bababa-emtec.scm b/.config/guix/system/desktop-bababa-emtec.scm
new file mode 100644
index 00000000..8aa12287
--- /dev/null
+++ b/.config/guix/system/desktop-bababa-emtec.scm
@@ -0,0 +1,15 @@
+;; With Eshell:
+;; *sudo -E guix system -L ~/.config/guix/system reconfigure ~/.config/guix/system/desktop-bababa-emtec.scm
+(define-module (desktop-bababa)
+  #:use-module (default)
+  #:use-module (gnu)
+  #:use-module (gnu system)
+  #:use-module (gnu services))
+
+(operating-system
+  (inherit %bababa/os)
+  (services (cons*
+             ;; TODO: Might need 9.6 for Iroha.
+             (postgresql-service)
+             (service docker-service-type)
+             (operating-system-services %bababa/os))))
diff --git a/.config/guix/system/desktop-bababa.scm b/.config/guix/system/desktop-bababa.scm
index fe8c78a8..2c4f8e2e 100644
--- a/.config/guix/system/desktop-bababa.scm
+++ b/.config/guix/system/desktop-bababa.scm
@@ -9,8 +9,6 @@
 
 (use-service-modules
  nix
- docker                                 ; REVIEW: Needs 'modprobe overlay'?
- databases                              ; PostgreSQL
  ;; libvirt:
  virtualization)
 
@@ -26,44 +24,44 @@
    (service nix-service-type)
    %ambrevar/services))
 
-(operating-system
-  (inherit default-operating-system)
-  (host-name "bababa")
+(define-public %bababa/os
+  (operating-system
+    (inherit %ambrevar/default-os)
+    (host-name "bababa")
 
-  (bootloader (bootloader-configuration
-               (bootloader grub-bootloader)
-               (timeout 1)
-               (target "/dev/sdb")))
+    (bootloader (bootloader-configuration
+                 (bootloader grub-bootloader)
+                 (timeout 1)
+                 (target "/dev/sdb")))
 
-  (kernel linux)
-  (firmware (append (list amdgpu-firmware)
-                    %ambrevar/firmware))
+    (kernel linux)
+    (firmware (append (list amdgpu-firmware)
+                      %ambrevar/firmware))
 
-  (file-systems (cons* (file-system
-                         (device (file-system-label "guixsd")) ; TODO: Change label to "guix".
-                         (mount-point "/")
-                         (type "ext4"))
-                       (file-system
-                         (device (file-system-label "babadata"))
-                         (mount-point "/media/babadata")
-                         (type "btrfs")
-                         (create-mount-point? #t))
-                       (file-system
-                         (mount-point "/tmp")
-                         (device "none")
-                         (type "tmpfs")
-                         (check? #f))
-                       %base-file-systems))
+    (file-systems (cons* (file-system
+                           (device (file-system-label "guixsd")) ; TODO: Change label to "guix".
+                           (mount-point "/")
+                           (type "ext4"))
+                         (file-system
+                           (device (file-system-label "babadata"))
+                           (mount-point "/media/babadata")
+                           (type "btrfs")
+                           (create-mount-point? #t))
+                         (file-system
+                           (mount-point "/tmp")
+                           (device "none")
+                           (type "tmpfs")
+                           (check? #f))
+                         %base-file-systems))
 
-  (packages (cons* nix
-                   stumpwm
-                   (operating-system-packages default-operating-system)))
+    (packages (cons* nix
+                     stumpwm
+                     (operating-system-packages default-operating-system)))
 
-  (services (cons*
-             (service libvirt-service-type
-                      (libvirt-configuration
-                       (unix-sock-group "kvm")))
-             ;; TODO: Might need 9.6 for Iroha.
-             (postgresql-service)
-             (service docker-service-type)
-             %bababa/services)))
+    (services (cons*
+               (service libvirt-service-type
+                        (libvirt-configuration
+                         (unix-sock-group "kvm")))
+               %bababa/services))))
+
+%bababa/os
diff --git a/.config/guix/system/laptop-mimimi.scm b/.config/guix/system/laptop-mimimi.scm
index 7354371d..bccf943d 100644
--- a/.config/guix/system/laptop-mimimi.scm
+++ b/.config/guix/system/laptop-mimimi.scm
@@ -123,7 +123,7 @@ EndSection")
                           (extra-config (list %mimimi/xorg-touchpad)))))))))
 
 (operating-system
-  (inherit default-operating-system)
+  (inherit %ambrevar/default-os)
   (host-name "mimimi")
 
   (kernel linux)