diff --git a/flake.lock b/flake.lock
index 89484ba..6cdea25 100644
--- a/flake.lock
+++ b/flake.lock
@@ -80,6 +80,22 @@
       }
     },
     "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-compat_3": {
       "locked": {
         "lastModified": 1696426674,
         "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
@@ -94,6 +110,24 @@
       }
     },
     "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1736143030,
+        "narHash": "sha256-+hu54pAoLDEZT9pjHlqL9DNzWz0NbUn8NEAHP7PQPzU=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "b905f6fc23a9051a6e1b741e1438dbfc0634c6de",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-parts_2": {
       "inputs": {
         "nixpkgs-lib": [
           "lanzaboote",
@@ -114,7 +148,7 @@
         "type": "github"
       }
     },
-    "flake-parts_2": {
+    "flake-parts_3": {
       "inputs": {
         "nixpkgs-lib": [
           "nixvim",
@@ -172,12 +206,34 @@
       }
     },
     "git-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1737043064,
+        "narHash": "sha256-I/OuxGwXwRi5gnFPsyCvVR+IfFstA+QXEpHu1hvsgD8=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "94ee657f6032d913fe0ef49adaa743804635b0bb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "git-hooks_2": {
       "inputs": {
         "flake-compat": [
           "nixvim",
           "flake-compat"
         ],
-        "gitignore": "gitignore_2",
+        "gitignore": "gitignore_3",
         "nixpkgs": [
           "nixvim",
           "nixpkgs"
@@ -198,6 +254,27 @@
       }
     },
     "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "gitignore_2": {
       "inputs": {
         "nixpkgs": [
           "lanzaboote",
@@ -219,7 +296,7 @@
         "type": "github"
       }
     },
-    "gitignore_2": {
+    "gitignore_3": {
       "inputs": {
         "nixpkgs": [
           "nixvim",
@@ -313,8 +390,8 @@
     "lanzaboote": {
       "inputs": {
         "crane": "crane",
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
+        "flake-compat": "flake-compat_2",
+        "flake-parts": "flake-parts_2",
         "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
@@ -374,22 +451,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-btrbk": {
-      "locked": {
-        "lastModified": 1735945390,
-        "narHash": "sha256-isFSp8EsqnFJE7o07XdT/eia0Rtzvz6NqLt4tCdFido=",
-        "owner": "cything",
-        "repo": "nixpkgs",
-        "rev": "acf701b49a7687e23b4b18701d4ab62285dec029",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cything",
-        "ref": "btrbk",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-garage": {
       "locked": {
         "lastModified": 1736921030,
@@ -406,6 +467,18 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1735774519,
+        "narHash": "sha256-CewEm1o2eVAnoqb6Ml+Qi9Gg/EfNAxbRx1lANGVyoLI=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/e9b51731911566bbf7e4895475a87fe06961de0b.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/e9b51731911566bbf7e4895475a87fe06961de0b.tar.gz"
+      }
+    },
     "nixpkgs-stable": {
       "locked": {
         "lastModified": 1710695816,
@@ -425,9 +498,9 @@
     "nixvim": {
       "inputs": {
         "devshell": "devshell",
-        "flake-compat": "flake-compat_2",
-        "flake-parts": "flake-parts_2",
-        "git-hooks": "git-hooks",
+        "flake-compat": "flake-compat_3",
+        "flake-parts": "flake-parts_3",
+        "git-hooks": "git-hooks_2",
         "home-manager": "home-manager_2",
         "nix-darwin": "nix-darwin",
         "nixpkgs": [
@@ -479,7 +552,7 @@
           "lanzaboote",
           "flake-compat"
         ],
-        "gitignore": "gitignore",
+        "gitignore": "gitignore_2",
         "nixpkgs": [
           "lanzaboote",
           "nixpkgs"
@@ -503,10 +576,11 @@
     "root": {
       "inputs": {
         "disko": "disko",
+        "flake-parts": "flake-parts",
+        "git-hooks": "git-hooks",
         "home-manager": "home-manager",
         "lanzaboote": "lanzaboote",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-btrbk": "nixpkgs-btrbk",
         "nixpkgs-garage": "nixpkgs-garage",
         "nixvim": "nixvim",
         "sops-nix": "sops-nix",
diff --git a/flake.nix b/flake.nix
index f11bde6..17f763a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,21 +27,21 @@
       url = "github:nix-community/nixvim";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    git-hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
 
-    nixpkgs-btrbk.url = "github:cything/nixpkgs/btrbk"; # unmerged PR
     nixpkgs-garage.url = "github:cything/nixpkgs/garage-module"; # unmerged PR
   };
 
   nixConfig = {
     extra-substituters = [
       "https://cache.cything.io/central"
-      "https://cache.cything.io/infra-ci"
-      "https://cache.cything.io/attic"
     ];
     extra-trusted-public-keys = [
       "central:uWhjva6m6dhC2hqNisjn2hXGvdGBs19vPkA1dPEuwFg="
-      "infra-ci:xG5f5tddUBcvToYjlpHD5OY/puYQkKmgKeIQCshNs38="
-      "attic:HL3hVpqXxwcF7Q1R+IvU2i0+YxIjQA2xxKM5EJMXLLs="
     ];
     builders-use-substitutes = true;
   };
@@ -53,127 +53,131 @@
       home-manager,
       treefmt,
       disko,
+      flake-parts,
       ...
     }@inputs:
-    let
-      lib = nixpkgs.lib;
-      inherit (self) outputs;
+    flake-parts.lib.mkFlake { inherit inputs; } (
+      { ... }:
+      {
+        imports = [
+          inputs.git-hooks.flakeModule
+        ];
+        debug = true;
+        systems = [
+          "x86_64-linux"
+        ];
+        perSystem =
+          {
+            pkgs,
+            system,
+            ...
+          }:
+          {
+            # make pkgs available to `perSystem`
+            _module.args.pkgs = import inputs.nixpkgs {
+              inherit system;
+              config = {
+                allowUnfree = true;
+              };
+            };
 
-      systems = [ "x86_64-linux" ];
-      forEachSystem = f: lib.genAttrs systems (system: f pkgsFor.${system});
-      overlays = [
-        # (overlayPkgsFromFlake inputs.eza [
-        # ])
-      ] ++ import ./overlay;
+            pre-commit = {
+              check.enable = true;
+              settings.hooks = {
+                nixfmt-rfc-style.enable = true;
+              };
+            };
 
-      pkgsFor = lib.genAttrs systems (
-        system:
-        import nixpkgs {
-          inherit system overlays;
-          config = {
-            allowUnfree = true;
-          };
-        }
-      );
-
-      treefmtEval = forEachSystem (
-        pkgs:
-        treefmt.lib.evalModule pkgs {
-          projectRootFile = "flake.nix";
-          programs.nixfmt.enable = true;
-          programs.stylua.enable = true;
-          programs.yamlfmt.enable = true;
-          programs.typos.enable = true;
-          programs.shellcheck.enable = true;
-          programs.deadnix.enable = true;
-
-          settings.global.excludes = [ "secrets/*" ];
-        }
-      );
-    in
-    {
-      formatter = forEachSystem (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
-      checks = forEachSystem (pkgs: {
-        formatting = treefmtEval.${pkgs.system}.config.build.check self;
-      });
-      # lets us build overlaid packages with `nix build .#<package>`
-      packages = pkgsFor;
-
-      nixosConfigurations =
-        let
-          pkgs = pkgsFor.x86_64-linux;
-        in
-        {
-          ytnix = lib.nixosSystem {
-            specialArgs = { inherit inputs outputs; };
-            modules = [
-              {
-                nixpkgs = { inherit pkgs; };
-              }
-              ./hosts/ytnix
-              inputs.sops-nix.nixosModules.sops
-              ./modules
-              inputs.lanzaboote.nixosModules.lanzaboote
-            ];
+            formatter = pkgs.nixfmt-rfc-style;
           };
 
-          chunk = lib.nixosSystem {
-            specialArgs = { inherit inputs outputs; };
-            modules = [
-              {
-                nixpkgs = { inherit pkgs; };
-                disabledModules = [
-                  "services/web-servers/garage.nix"
+        flake = {
+          nixosConfigurations =
+            let
+              pkgs = import nixpkgs {
+                config.allowUnfree = true;
+                system = "x86_64-linux";
+              };
+              lib = nixpkgs.lib;
+            in
+            {
+              ytnix = lib.nixosSystem {
+                modules = [
+                  {
+                    nixpkgs = { inherit pkgs; };
+                  }
+                  ./hosts/ytnix
+                  inputs.sops-nix.nixosModules.sops
+                  ./modules
+                  inputs.lanzaboote.nixosModules.lanzaboote
                 ];
-              }
-              ./hosts/chunk
-              inputs.sops-nix.nixosModules.sops
-              ./modules
-              (inputs.nixpkgs-garage + "/nixos/modules/services/web-servers/garage.nix")
-            ];
-          };
+              };
+              chunk = lib.nixosSystem {
+                specialArgs = { inherit inputs; };
+                modules = [
+                  {
+                    nixpkgs = { inherit pkgs; };
+                    disabledModules = [
+                      "services/web-servers/garage.nix"
+                    ];
+                  }
+                  ./hosts/chunk
+                  inputs.sops-nix.nixosModules.sops
+                  ./modules
+                  (inputs.nixpkgs-garage + "/nixos/modules/services/web-servers/garage.nix")
+                ];
+              };
 
-          titan = lib.nixosSystem {
-            specialArgs = { inherit inputs outputs; };
-            modules = [
-              {
-                nixpkgs = { inherit pkgs; };
-              }
-              ./hosts/titan
-              disko.nixosModules.disko
-              inputs.sops-nix.nixosModules.sops
-              ./modules
-            ];
-          };
-        };
+              titan = lib.nixosSystem {
+                specialArgs = { inherit inputs; };
+                modules = [
+                  {
+                    nixpkgs = { inherit pkgs; };
+                  }
+                  ./hosts/titan
+                  disko.nixosModules.disko
+                  inputs.sops-nix.nixosModules.sops
+                  ./modules
+                ];
+              };
+            };
+          homeConfigurations =
+            let
+              pkgs = import nixpkgs {
+                config.allowUnfree = true;
+                system = "x86_64-linux";
+              };
+              lib = home-manager.lib;
+            in
+            {
+              "yt@ytnix" = lib.homeManagerConfiguration {
+                inherit pkgs;
+                extraSpecialArgs = { inherit inputs; };
+                modules = [
+                  ./home/yt/ytnix.nix
+                  inputs.nixvim.homeManagerModules.nixvim
+                ];
+              };
 
-      homeConfigurations = {
-        "yt@ytnix" = home-manager.lib.homeManagerConfiguration {
-          pkgs = pkgsFor.x86_64-linux;
-          extraSpecialArgs = { inherit inputs outputs; };
-          modules = [
-            ./home/yt/ytnix.nix
-            inputs.nixvim.homeManagerModules.nixvim
-          ];
-        };
+              "yt@chunk" = lib.homeManagerConfiguration {
+                inherit pkgs;
+                extraSpecialArgs = { inherit inputs; };
+                modules = [
+                  ./home/yt/chunk.nix
+                  inputs.nixvim.homeManagerModules.nixvim
+                ];
+              };
 
-        "yt@chunk" = home-manager.lib.homeManagerConfiguration {
-          pkgs = pkgsFor.x86_64-linux;
-          extraSpecialArgs = { inherit inputs outputs; };
-          modules = [
-            ./home/yt/chunk.nix
-            inputs.nixvim.homeManagerModules.nixvim
-          ];
+              "codespace@codespace" = lib.homeManagerConfiguration {
+                inherit pkgs;
+                extraSpecialArgs = { inherit inputs; };
+                modules = [
+                  ./home/yt/codespace.nix
+                  inputs.nixvim.homeManagerModules.nixvim
+                ];
+              };
+            };
         };
-
-        "codespace@codespace" = home-manager.lib.homeManagerConfiguration {
-          pkgs = pkgsFor.x86_64-linux;
-          extraSpecialArgs = { inherit inputs outputs; };
-          modules = [
-            ./home/yt/codespace.nix
-            inputs.nixvim.homeManagerModules.nixvim
-          ];
-        };
-      };
-    };
+      }
+    );
 }
diff --git a/home/vscode.nix b/home/vscode.nix
index 6f099d7..d2b7bb0 100644
--- a/home/vscode.nix
+++ b/home/vscode.nix
@@ -1,4 +1,5 @@
-{pkgs, ...}: {
+{ pkgs, ... }:
+{
   programs.vscode = {
     enable = true;
     package = pkgs.vscodium;
diff --git a/hosts/ytnix/default.nix b/hosts/ytnix/default.nix
index 016582b..f6e5c55 100644
--- a/hosts/ytnix/default.nix
+++ b/hosts/ytnix/default.nix
@@ -1,7 +1,6 @@
 {
   config,
   pkgs,
-  inputs,
   lib,
   ...
 }:
@@ -10,12 +9,6 @@
     ./hardware-configuration.nix
     ../common.nix
     ../zsh.nix
-    {
-      disabledModules = [
-        "services/backup/btrbk.nix"
-      ];
-    }
-    (inputs.nixpkgs-btrbk + "/nixos/modules/services/backup/btrbk.nix")
   ];
 
   sops.age.keyFile = "/root/.config/sops/age/keys.txt";