config: add borg backups

sys/platforms/posixlycorrect/borg.nix

@@ -0,0 +1,46 @@
+{
+  config,
+  pkgs,
+  lib,
+  flakes,
+  ...
+}: {
+  services.borgbackup.jobs = {
+    rsync = {
+      paths = [
+        "/home/fabian/nix"
+      ];
+      exclude = [
+      ];
+      user = "root";
+      group = "root";
+      doInit = true;
+      startAt = [
+        "hourly"
+      ];
+      inhibitsSleep = true;
+      persistentTimer = true;
+
+      repo = "zh5777@zh5777.rsync.net:posixlycorrect";
+      encryption = {
+        mode = "repokey-blake2";
+        passCommand = "cat /var/trust/borg/posixlycorrect_passphrase";
+      };
+      compression = "auto,lz4";
+      prune = {
+        keep = {
+          hourly = 24;
+          daily = 7;
+          weekly = 4;
+          monthly = 12;
+          yearly = 99;
+        };
+      };
+      extraArgs = [
+        "--remote-path=borg14"
+      ];
+    };
+  };
+
+  environment.sessionVariables.BORG_REMOTE_PATH = "borg14";
+}

sys/platforms/posixlycorrect/default.nix

@@ -9,6 +9,7 @@
     flakes.home-manager.nixosModules.home-manager
     flakes.impermanence.nixosModule
     ./hardware-configuration.nix
+    ./borg.nix
   ];
 
   local.sys = {