diff --git a/common/global/nix.nix b/common/global/nix.nix
index 77780ee..eb822c1 100644
--- a/common/global/nix.nix
+++ b/common/global/nix.nix
@@ -15,17 +15,14 @@ in
       ];
       trusted-substituters = [
         "https://cache.nixos.org"
-        "https://cache.tmmworkshop.com"
         "https://nix-community.cachix.org"
       ];
       substituters = [
         "https://cache.nixos.org/?priority=2&want-mass-query=true"
-        "https://cache.tmmworkshop.com/?priority=2&want-mass-query=true"
         "https://nix-community.cachix.org/?priority=10&want-mass-query=true"
       ];
       trusted-public-keys = [
         "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
-        "cache.tmmworkshop.com:jHffkpgbmEdstQPoihJPYW9TQe6jnQbWR2LqkNGV3iA="
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
       ];
       auto-optimise-store = lib.mkDefault true;
diff --git a/common/optional/tmmworkshop_cache.nix b/common/optional/tmmworkshop_cache.nix
new file mode 100644
index 0000000..f5b5a63
--- /dev/null
+++ b/common/optional/tmmworkshop_cache.nix
@@ -0,0 +1,7 @@
+{
+  nix.settings = {
+    trusted-substituters = [ "http://cache.tmmworkshop.com" ];
+    substituters = [ "http://cache.tmmworkshop.com/?priority=1&want-mass-query=true" ];
+    trusted-public-keys = [ "cache.tmmworkshop.com:jHffkpgbmEdstQPoihJPYW9TQe6jnQbWR2LqkNGV3iA=" ];
+  };
+}
diff --git a/flake.nix b/flake.nix
index afbf2ff..531100c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,12 +4,10 @@
   nixConfig = {
     extra-substituters = [
       "https://cache.nixos.org/?priority=2&want-mass-query=true"
-      "https://cache.tmmworkshop.com/?priority=2&want-mass-query=true"
       "https://nix-community.cachix.org/?priority=10&want-mass-query=true"
     ];
     extra-trusted-public-keys = [
       "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" # cspell:disable-line
-      "cache.tmmworkshop.com:jHffkpgbmEdstQPoihJPYW9TQe6jnQbWR2LqkNGV3iA=" # cspell:disable-line
       "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=" # cspell:disable-line
       "cache-nix-dot:Od9KN34LXc6Lu7y1ozzV1kIXZa8coClozgth/SYE7dU=" # cspell:disable-line
     ];
diff --git a/users/richie/home/cli/zsh.nix b/users/richie/home/cli/zsh.nix
index 4b6a5e9..32246b3 100644
--- a/users/richie/home/cli/zsh.nix
+++ b/users/richie/home/cli/zsh.nix
@@ -25,6 +25,7 @@
 
       "rspace" = "'for f in *\ *; do mv \"$f\" \"\${f// /_}\"; done'";
       "rebuild" = "sudo nixos-rebuild switch --flake /home/richie/dotfiles#$HOST";
+      "rebuild_backup" = "sudo nixos-rebuild switch --flake /home/richie/dotfiles#$HOST   --option substituters 'https://nix-community.cachix.org' --option trusted-public-keys 'cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY='";
       "nix-test" = "nixos-rebuild test --flake /home/richie/dotfiles";
     };
   };