diff --git a/nixos/modules/admin.nix b/nixos/modules/admin.nix
index bd03ba7..05acc43 100644
--- a/nixos/modules/admin.nix
+++ b/nixos/modules/admin.nix
@@ -97,7 +97,7 @@ in
     services.openssh.openFirewall = true;
 
     users.users = mapAttrs (user: keys: {
-      shell = shells."${keys.shell}";
+      shell = lib.mkDefault shells."${keys.shell}";
       extraGroups = lib.mkDefault extraGroups;
       isNormalUser = true;
       openssh.authorizedKeys.keys = keys.keys;
diff --git a/nixos/ninurta/configuration.nix b/nixos/ninurta/configuration.nix
index 39bdca7..46562a8 100644
--- a/nixos/ninurta/configuration.nix
+++ b/nixos/ninurta/configuration.nix
@@ -149,6 +149,13 @@ in
     startAt = "daily";
   };
 
+  services.postgresqlBackup = {
+    enable = true;
+    backupAll = true;
+    compression = "zstd";
+    location = "/var/backup/postgresql";
+  };
+
   age.secrets."ninurta-backup-passphrase" = {
     file = "${secretsPath}/ninurta-backup-passphrase.age";
     mode = "400";