feat: migrate remaining applications, services, and user configurations

users/backup/default.nix

@@ -0,0 +1,21 @@
+{ config, lib, ... }:
+
+let
+  cfg = config.homelab.users.backup;
+in {
+  options.homelab.users.backup.enable = lib.mkEnableOption "user Backup";
+
+  config = lib.mkIf cfg.enable {
+    users.users.backup = {
+      description = "Backup User";
+      isNormalUser = true;
+      extraGroups = [
+        "docker" # Allow access to the docker socket.
+      ];
+      openssh.authorizedKeys.keys = [
+        # Hugo
+        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICms6vjhE9kOlqV5GBPGInwUHAfCSVHLI2Gtzee0VXPh"
+      ];
+    };
+  };
+}