diff --git a/darwin/homebrew.nix b/darwin/homebrew.nix
index ffbb5a8..a43ae77 100644
--- a/darwin/homebrew.nix
+++ b/darwin/homebrew.nix
@@ -48,7 +48,7 @@ in
   homebrew.masApps = {
     Bitwarden = 1352778147;
     Spark = 1176895641;
-    Wireguard = 1451685025;
+    Tailscale = 1475387142;
     Xcode = 497799835;
   };
 
@@ -89,7 +89,7 @@ in
 
   # Configuration related to casks
   environment.variables.SSH_AUTH_SOCK = mkIfCaskPresent "secretive"
-    "/Users/${config.users.primaryUser.username}/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
+    "${config.home.homeDirectory}/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
 
   # For cli packages that aren't currently available for macOS in `nixpkgs`.Packages should be
   # installed in `../home/default.nix` whenever possible.
@@ -98,6 +98,7 @@ in
     "fileicon"
     "fzf"
     "gifsicle"
+    "tarsnap"
     "unison-language"
   ];
 }
diff --git a/flake.nix b/flake.nix
index e6bd099..462ba6d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -274,7 +274,10 @@
         # configs
         configs-starship-symbols = import ./home/configs/starship-symbols.nix;
         copyApplications = import ./home/copyApplications.nix;
-        dark-mode-notify-service = import ./home/dark-mode-notify-service.nix;
+        # services
+        dark-mode-notify-service = import ./home/services/dark-mode-notify.nix;
+        tarsnap-service = import ./home/services/tarsnap.nix;
+        # etc
         files = import ./home/files.nix;
         fish = import ./home/fish.nix;
         git = import ./home/git.nix;
diff --git a/home/dark-mode-notify-service.nix b/home/dark-mode-notify-service.nix
deleted file mode 100644
index 5748e20..0000000
--- a/home/dark-mode-notify-service.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-{ pkgs, ... }: {
-  # dark-mode-notify configuration
-  # {{{
-  launchd.agents.dark-mode-notify = {
-    enable = true;
-    config = {
-      Label = "ke.bou.dark-mode-notify";
-      KeepAlive = true;
-      StandardErrorPath = null;
-      StandardOutPath = null;
-      ProgramArguments = [
-        "${pkgs.dark-mode-notify}/bin/dark-mode-notify"
-        "${pkgs.fish}/bin/fish"
-        "-c"
-        "set-background-to-env DARKMODE"
-      ];
-    };
-  };
-  # }}}
-}
diff --git a/home/files.nix b/home/files.nix
index ab30d59..ef7551b 100644
--- a/home/files.nix
+++ b/home/files.nix
@@ -5,11 +5,21 @@
     enable = true;
   };
 
-  home.file.".pijulconfig".text = ''
-    [author]
-    name = "mat"
-    full_name = "${config.programs.git.userName}"
-    email = "${config.programs.git.userEmail}"
-  '';
+  home.file = {
+    ".pijulconfig".text = ''
+      [author]
+      name = "${config.home.primaryUser.username}"
+      full_name = "${config.home.primaryUser.fullName}"
+      email = "${config.home.primaryUser.email}"
+    '';
+    ".tarsnaprc".text = ''
+      cachedir ${config.xdg.cacheHome}
+      keyfile ${config.xdg.configHome}/tarsnap/read-write-delete.key
+      nodump
+      print-stats
+      checkpoint-bytes 1G
+      humanize-numbers
+    '';
+  };
   # }}}
 }
diff --git a/home/fish.nix b/home/fish.nix
index a9a999f..574ff0f 100644
--- a/home/fish.nix
+++ b/home/fish.nix
@@ -6,9 +6,7 @@
   programs.fish.enable = true;
 
   # Add Fish plugins
-  home.packages = with pkgs.fishPlugins; [
-    done
-  ];
+  home.packages = with pkgs.fishPlugins; [ done ];
 
   programs.fish.plugins = [
     {
@@ -154,7 +152,7 @@
     };
 
     darwin-rebuild-edit-with = {
-      argumentNames = [ "file" "editor" ];
+      argumentNames = [ "editor" "file" ];
       body = ''
         if test -z "$file"
           set file flake.nix
@@ -162,6 +160,13 @@
         from-nix $editor $file
       '';
     };
+
+    nix-unfree = {
+      argumentNames = [ "cmd" ];
+      body = ''
+        env NIX_ALLOW_UNFREE=1 nix $cmd --impure
+      '';
+    };
   };
   # }}}
 
@@ -170,11 +175,11 @@
   # Aliases
   programs.fish.shellAliases =
     let
-      nixConfigDir = "${config.home.homeDirectory}/dotfiles.nix";
+      inherit (config.home.primaryUser) nixConfigDirectory;
     in
     with pkgs; {
       # Nix related
-      from-nix = "from-dir ${nixConfigDir}";
+      from-nix = "from-dir ${nixConfigDirectory}";
       # darwin-rebuild build 
       drb = "from-nix darwin-rebuild build --flake .";
       # darwin-rebuild switch full
@@ -182,19 +187,22 @@
       # darwin-rebuild switch (no homebrew)
       drs = "from-nix darwin-rebuild switch --flake . --override-input homebrew-enabled github:boolean-option/false";
       # edit darwin-rebuild config in code/codium
-      drc = "code ${nixConfigDir}";
+      drc = "code ${nixConfigDirectory}";
       # edit darwin-rebuild config in vim
-      drv = "vim ${nixConfigDir}";
+      drv = "vim ${nixConfigDirectory}";
       # edit darwin-rebuild config in helix
       drh = "darwin-rebuild-edit-with hx";
-      flakeup = "nix flake update ${nixConfigDir}/";
+      flakeup = "nix flake update ${nixConfigDirectory}/";
       nb = "nix build";
       nd = "nix develop";
       nf = "nix flake";
       nr = "nix run";
+      nru = "nix-unfree run";
       ns = "nix search nixpkgs";
       nsh = "nix shell";
-      nrp = "nix repl --expr '{pkgs=(import <nixpkgs> {});}'";
+      nshu = "nix-unfree shell";
+      nrp = "nix repl --expr '{ pkgs = (import <nixpkgs> { }); }'";
+      nrpu = "nix repl --expr '{ pkgs = (import <nixpkgs> { config.allowUnfree = true; }); }' --impure";
 
       # Other
       ".." = "cd ..";
@@ -212,7 +220,7 @@
       tb = "toggle-background";
     } // lib.optionalAttrs stdenv.isDarwin {
       sb = "set-background-to-macOS";
-      conda-init = "eval /opt/homebrew/Caskroom/miniforge/base/bin/conda 'shell.fish' 'hook' $argv | source";
+      conda-init = "eval /opt/homebrew/bin/conda 'shell.fish' 'hook' $argv | source";
     };
 
   # Configuration that should be above `loginShellInit` and `interactiveShellInit`.
diff --git a/home/programs.nix b/home/programs.nix
index 13812b5..f2b0a0a 100644
--- a/home/programs.nix
+++ b/home/programs.nix
@@ -51,8 +51,7 @@
         UseKeychain = "yes";
         AddKeysToAgent = "yes";
       } // lib.optionalAttrs pkgs.stdenv.isDarwin {
-        # TODO: gate this behind a check if the cask is present
-        IdentityAgent = "~/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
+        IdentityAgent = "${config.home.homeDirectory}/Library/Containers/com.maxgoedjen.Secretive.SecretAgent/Data/socket.ssh";
       };
     };
     # vscode
diff --git a/home/services/dark-mode-notify.nix b/home/services/dark-mode-notify.nix
new file mode 100644
index 0000000..f4e1653
--- /dev/null
+++ b/home/services/dark-mode-notify.nix
@@ -0,0 +1,22 @@
+{ pkgs, ... }: {
+  # dark-mode-notify configuration
+  # {{{
+  launchd.agents.dark-mode-notify =
+    let logPath = "/var/log/dark-mode-notify"; in
+    {
+      enable = true;
+      config = {
+        Label = "ke.bou.dark-mode-notify";
+        KeepAlive = true;
+        StandardErrorPath = "${logPath}/error.log";
+        StandardOutPath = "${logPath}/out.log";
+        ProgramArguments = [
+          "${pkgs.dark-mode-notify}/bin/dark-mode-notify"
+          "${pkgs.fish}/bin/fish"
+          "-c"
+          "set-background-to-env DARKMODE"
+        ];
+      };
+    };
+  # }}}
+}
diff --git a/home/services/tarsnap.nix b/home/services/tarsnap.nix
new file mode 100644
index 0000000..096ec93
--- /dev/null
+++ b/home/services/tarsnap.nix
@@ -0,0 +1,44 @@
+{ config, pkgs, ... }: {
+  # tarsnap periodic backup configuration
+  # {{{
+  launchd.agents.tarsnap =
+    let
+      logPath = "/var/log/tarsnap";
+      tarsnapBackup = pkgs.writeShellScriptBin "tarsnap-backup-helper" ''
+        /opt/homebrew/bin/tarsnap -v -c \
+          --configfile ${config.home.homeDirectory}/.tarsnaprc \
+          -f $(uname -n)-$(date -u +%Y-%m-%dT%H:%M:%SZ) \
+          ${config.home.homeDirectory}/{dotfiles.nix,Desktop,Development,Documents,Downloads}
+      '';
+    in
+    {
+      enable = true;
+      config = {
+        Label = "com.tarsnap.tarsnap";
+        StandardErrorPath = "${logPath}/error.log";
+        StandardOutPath = "${logPath}/out.log";
+        StartCalendarInterval = [
+          {
+            # every sunday
+            Weekday = 0;
+            # at midnight
+            Hour = 0;
+            Minute = 0;
+          }
+          {
+            # every wednesday
+            Weekday = 3;
+            # at noon
+            Hour = 12;
+            Minute = 0;
+          }
+        ];
+        Program = "${tarsnapBackup}/bin/tarsnap-backup-helper";
+      };
+    };
+  # }}}
+}
+
+
+
+