Initial commit: Ultimate Notetaking, Sync & Backup System

A NixOS-based system for managing personal data across three tiers:
- Tier 1: Configuration (shareable via git)
- Tier 2: Syncable data (nb + Syncthing)
- Tier 3: Large data (self-hosted services + backup)

Includes:
- NixOS modules for nb, Syncthing, backup (restic)
- Server modules for Forgejo, Immich, Jellyfin
- Helper scripts (usync, ustatus)
- Comprehensive documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hosts/example/configuration.nix

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+# Example Host Configuration
+#
+# This is a template for your machine's configuration.nix.
+# Copy this to hosts/your-hostname/configuration.nix and customize.
+#
+# To use:
+# 1. Copy this file to hosts/<your-hostname>/configuration.nix
+# 2. Generate hardware-configuration.nix: nixos-generate-config --show-hardware-config
+# 3. Customize the settings below
+# 4. Add to flake.nix outputs
+
+{ config, pkgs, lib, inputs, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix  # Generate with nixos-generate-config
+  ];
+
+  # ============================================================================
+  # SYSTEM BASICS
+  # ============================================================================
+
+  networking.hostName = "example";  # Change this!
+
+  # Bootloader (adjust for your system)
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  # Networking
+  networking.networkmanager.enable = true;
+
+  # Timezone and locale
+  time.timeZone = "America/New_York";  # Change this!
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  # ============================================================================
+  # USERS
+  # ============================================================================
+
+  users.users.youruser = {  # Change this!
+    isNormalUser = true;
+    description = "Your Name";
+    extraGroups = [ "wheel" "networkmanager" ];
+    shell = pkgs.zsh;  # Or bash, fish, etc.
+  };
+
+  # ============================================================================
+  # TIER 1: CONFIGURATION
+  # ============================================================================
+
+  # Enable Nix flakes
+  nix.settings = {
+    experimental-features = [ "nix-command" "flakes" ];
+    auto-optimise-store = true;
+  };
+
+  # Garbage collection
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
+  # ============================================================================
+  # TIER 2: NOTES (nb)
+  # ============================================================================
+
+  programs.nb = {
+    enable = true;
+    editor = "nvim";
+    defaultExtension = "md";
+
+    # Configure your notebooks
+    notebooks = {
+      # personal = {
+      #   remote = "git@forgejo.yourdomain.com:youruser/personal-notes.git";
+      # };
+      # work = {
+      #   remote = "git@forgejo.yourdomain.com:youruser/work-notes.git";
+      # };
+    };
+  };
+
+  # ============================================================================
+  # TIER 2: SYNC (Syncthing)
+  # ============================================================================
+
+  services.syncthing-managed = {
+    enable = true;
+    user = "youruser";  # Change this!
+
+    # Add your device IDs here
+    devices = {
+      # laptop = {
+      #   id = "XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX";
+      # };
+      # desktop = {
+      #   id = "YYYYYYY-YYYYYYY-YYYYYYY-YYYYYYY-YYYYYYY-YYYYYYY-YYYYYYY-YYYYYYY";
+      # };
+    };
+
+    # Configure folders to sync
+    folders = {
+      # documents = {
+      #   path = "/home/youruser/Documents";
+      #   devices = [ "laptop" "desktop" ];
+      #   versioning = { type = "simple"; params.keep = "5"; };
+      # };
+    };
+  };
+
+  # ============================================================================
+  # TIER 3: BACKUP
+  # ============================================================================
+
+  services.backup = {
+    enable = true;
+
+    # Configure your backup repository
+    # repository = "b2:your-bucket:backup";
+    repository = "/mnt/backup";  # Local example
+
+    # Paths to back up
+    paths = [
+      "/home/youruser/Documents"
+      "/home/youruser/notes"
+      # Add more paths
+    ];
+
+    # Password file (create this manually or use sops-nix)
+    passwordFile = "/etc/restic-password";  # Create this!
+
+    # For cloud storage, set environment file
+    # environmentFile = "/etc/restic-env";
+
+    # Schedule: 2 AM daily
+    schedule = "*-*-* 02:00:00";
+  };
+
+  # ============================================================================
+  # EDITOR
+  # ============================================================================
+
+  programs.neovim = {
+    enable = true;
+    defaultEditor = true;
+    viAlias = true;
+    vimAlias = true;
+  };
+
+  # ============================================================================
+  # PACKAGES
+  # ============================================================================
+
+  environment.systemPackages = with pkgs; [
+    # Shell essentials
+    git
+    ripgrep
+    fd
+    jq
+    htop
+    tmux
+
+    # Development
+    neovim
+
+    # Sync & backup (installed by modules, but explicit is fine)
+    syncthing
+    restic
+    rclone
+  ];
+
+  # ============================================================================
+  # SECRETS (sops-nix)
+  # ============================================================================
+
+  # Uncomment and configure when you set up sops-nix
+  #
+  # sops = {
+  #   defaultSopsFile = ../../secrets/secrets.yaml;
+  #   age.keyFile = "/home/youruser/.config/sops/age/keys.txt";
+  #
+  #   secrets = {
+  #     "restic-password" = {};
+  #     "syncthing-key" = {
+  #       owner = "youruser";
+  #     };
+  #   };
+  # };
+
+  # ============================================================================
+  # SERVICES
+  # ============================================================================
+
+  services.openssh.enable = true;
+
+  # ============================================================================
+  # SYSTEM
+  # ============================================================================
+
+  system.stateVersion = "24.05";  # Don't change after initial install
+}