diff --git a/modules/btrbk/default.nix b/modules/btrbk/default.nix
index fd6258c..ab557a0 100644
--- a/modules/btrbk/default.nix
+++ b/modules/btrbk/default.nix
@@ -1,4 +1,25 @@
 { config, pkgs, ... }:
+let
+  ssd-subvolumes = {
+    "arch.p1st.de" = {};
+    "blogger.privacy1st.de" = {};
+    "changedetection.p1st.de" = {};
+    "cloud.privacy1st.de" = {};
+    "git.privacy1st.de" = {};
+    "mastodon-toot-follower.privacy1st.de" = {};
+    "money.p1st.de" = {};
+    "music.privacy1st.de" = {};
+    "paste.p1st.de" = {};
+    "proxy" = {};
+    "recipe.privacy1st.de" = {};
+    "traggo.privacy1st.de" = {};
+  };
+  hdd-subvolumes = {
+    "cloud.privacy1st.de" = {};
+    # MediaKollektiv: 796 GiB
+    "cloud.media-kollektiv.eu" = {};
+  };
+in
 {
   # For each instance, a service and timer will be created:
   #   systemctl list-unit-files | grep btrbk
@@ -32,28 +53,11 @@
 
           volume."/jc-data" = {
             snapshot_dir = "/snap";
-            subvolume = {
-              "arch.p1st.de" = {};
-              "blogger.privacy1st.de" = {};
-              "changedetection.p1st.de" = {};
-              "cloud.privacy1st.de" = {};
-              "git.privacy1st.de" = {};
-              "mastodon-toot-follower.privacy1st.de" = {};
-              "money.p1st.de" = {};
-              "music.privacy1st.de" = {};
-              "paste.p1st.de" = {};
-              "proxy" = {};
-              "recipe.privacy1st.de" = {};
-              "traggo.privacy1st.de" = {};
-            };
+            subvolume = ssd-subvolumes;
           };
           volume."/mnt/data/jc-data" = {
             snapshot_dir = "/mnt/data/snap";
-            subvolume = {
-              "cloud.privacy1st.de" = {};
-              # MediaKollektiv: 796 GiB
-              "cloud.media-kollektiv.eu" = {};
-            };
+            subvolume = hdd-subvolumes;
           };
         };
       };
@@ -77,29 +81,12 @@
           volume."/jc-data" = {
             snapshot_dir = "/snap";
             target = "/mnt/backup/snap";
-            subvolume = {
-              "arch.p1st.de" = {};
-              "blogger.privacy1st.de" = {};
-              "changedetection.p1st.de" = {};
-              "cloud.privacy1st.de" = {};
-              "git.privacy1st.de" = {};
-              "mastodon-toot-follower.privacy1st.de" = {};
-              "money.p1st.de" = {};
-              "music.privacy1st.de" = {};
-              "paste.p1st.de" = {};
-              "proxy" = {};
-              "recipe.privacy1st.de" = {};
-              "traggo.privacy1st.de" = {};
-            };
+            subvolume = ssd-subvolumes;
           };
           volume."/mnt/data/jc-data" = {
             snapshot_dir = "/mnt/data/snap";
             target = "/mnt/backup/snap2";
-            subvolume = {
-              "cloud.privacy1st.de" = {};
-              # MediaKollektiv: 796 GiB
-              "cloud.media-kollektiv.eu" = {};
-            };
+            subvolume = hdd-subvolumes;
           };
         };
       };