diff --git a/hosts/mauville/home.nix b/hosts/mauville/home.nix
index b96163a7..fc666f83 100644
--- a/hosts/mauville/home.nix
+++ b/hosts/mauville/home.nix
@@ -66,41 +66,77 @@
     users.aly = {
       imports = [../../homes/aly.nix];
       systemd.user = {
-        services.backblaze-sync = {
-          Unit = {
-            Description = "Backup to Backblaze.";
+        services = {
+          backblaze-sync = {
+            Unit = {
+              Description = "Backup to Backblaze.";
+            };
+            Service = {
+              ExecStart = "${pkgs.writeShellScript "backblaze-sync" ''
+                declare -A backups
+                backups=(
+                  ['/home/aly/pics/camera']="b2://aly-camera"
+                  ['/home/aly/sync']="b2://aly-sync"
+                  ['/mnt/Archive/Archive']="b2://aly-archive"
+                  ['/mnt/Media/Audiobooks']="b2://aly-audiobooks"
+                  ['/mnt/Media/Music']="b2://aly-music"
+                )
+                # Recursively backup folders to B2 with sanity checks.
+                for folder in "''${!backups[@]}"; do
+                  if [ -d "$folder" ] && [ "$(ls -A "$folder")" ]; then
+                    ${lib.getExe pkgs.backblaze-b2} sync --delete $folder ''${backups[$folder]}
+                  else
+                    echo "$folder does not exist or is empty."
+                    exit 1
+                  fi
+                done
+              ''}";
+            };
           };
-          Service = {
-            ExecStart = "${pkgs.writeShellScript "backblaze-sync" ''
-              declare -A backups
-              backups=(
-                ['/home/aly/pics/camera']="b2://aly-camera"
-                ['/home/aly/sync']="b2://aly-sync"
-                ['/mnt/Archive/Archive']="b2://aly-archive"
-                ['/mnt/Media/Audiobooks']="b2://aly-audiobooks"
-                ['/mnt/Media/Music']="b2://aly-music"
-              )
-              # Recursively backup folders to B2 with sanity checks.
-              for folder in "''${!backups[@]}"; do
-                if [ -d "$folder" ] && [ "$(ls -A "$folder")" ]; then
-                  ${lib.getExe pkgs.backblaze-b2} sync --delete $folder ''${backups[$folder]}
-                else
-                  echo "$folder does not exist or is empty."
-                  exit 1
-                fi
-              done
-            ''}";
+
+          build-hosts = {
+            Unit = {
+              Description = "Build nixosConfiguration for each host.";
+            };
+            Service = {
+              ExecStart = "${pkgs.writeShellScript "build-hosts" ''
+                hosts=(
+                  fallarbor
+                  lavaridge
+                  petalburg
+                  rustboro
+                )
+
+                for h in "''${hosts[@]}"; do
+                  nix build github:alyraffauf/nixcfg#nixosConfigurations.$h.config.system.build.toplevel
+                done
+              ''}";
+            };
           };
         };
-        timers.backblaze-sync = {
-          Unit = {
-            Description = "Daily backups to Backblaze.";
+
+        timers = {
+          backblaze-sync = {
+            Unit = {
+              Description = "Daily backups to Backblaze.";
+            };
+            Install = {
+              WantedBy = ["timers.target"];
+            };
+            Timer = {
+              OnCalendar = "*-*-* 03:00:00";
+            };
           };
-          Install = {
-            WantedBy = ["timers.target"];
-          };
-          Timer = {
-            OnCalendar = "*-*-* 03:00:00";
+          build-hosts = {
+            Unit = {
+              Description = "Build hosts daily.";
+            };
+            Install = {
+              WantedBy = ["timers.target"];
+            };
+            Timer = {
+              OnCalendar = "*-*-* 06:00:00";
+            };
           };
         };
       };