diff --git a/hosts/backup-4/configuration.nix b/hosts/backup-4/configuration.nix
new file mode 100644
index 0000000..7b693ee
--- /dev/null
+++ b/hosts/backup-4/configuration.nix
@@ -0,0 +1,42 @@
+{ config, pkgs, ... }:
+
+{
+  imports =
+    [
+      ./hardware-configuration.nix
+      ../../configuration/common
+      ../../configuration/proxmox-vm
+    ];
+
+  boot.loader.grub.enable = true;
+  boot.loader.grub.version = 2;
+  boot.loader.grub.device = "/dev/vda";
+
+  networking.hostName = "backup-4";
+
+  networking.useDHCP = false;
+  networking.interfaces.ens18.ipv6.addresses = [ { address = "2001:638:904:ffcb::c"; prefixLength = 64; } ];
+  networking.defaultGateway6 = { address = "2001:638:904:ffcb::1"; interface = "ens18"; };
+  networking.nameservers = [ "2001:638:904:ffcc::3" "2001:638:904:ffcc::4" "141.24.40.3" "141.24.40.4" ];
+
+  services.rsnapshot = {
+    enable = true;
+    extraConfig = ''
+      snapshot_root	/mnt/backup-4/
+      retain	daily	14
+      ssh_args	-o BatchMode=yes -o IdentityFile=/var/src/secrets/rsnapshot/id_rsa
+      backup	backup-replication@clerie-backup.net.clerie.de:/clerie-backup-replication/	clerie-backup/
+    '';
+    cronIntervals = {
+      daily = "15 6 * * * ";
+    };
+  };
+
+  clerie.monitoring = {
+    enable = true;
+    id = "205";
+    pubkey = "CLEF5hLdjwPqfU1oaM16fusJ705iNzUBxYsb4/YuGw4=";
+  };
+
+  system.stateVersion = "21.03";
+}
diff --git a/hosts/backup-4/hardware-configuration.nix b/hosts/backup-4/hardware-configuration.nix
new file mode 100644
index 0000000..c2490b8
--- /dev/null
+++ b/hosts/backup-4/hardware-configuration.nix
@@ -0,0 +1,28 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "virtio_pci" "virtio_scsi" "sd_mod" "sr_mod" "virtio_blk" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/eb9bcb35-4f34-4cd6-b1b3-3a86de40571b";
+      fsType = "ext4";
+    };
+
+  fileSystems."/mnt/backup-4" =
+    { device = "/dev/disk/by-uuid/f4d2a27d-664b-45f7-abc2-adf6691ad363";
+      fsType = "ext4";
+    };
+
+  swapDevices = [ ];
+
+}