sombrero: Add restic module

hosts/sombrero/modules/restic/default.nix

@@ -0,0 +1,43 @@
+{ pkgs, lib, config, ... }:
+let
+  enabled = config.mod.restic.enable;
+in
+{
+  options = {
+    mod.restic = {
+      enable = lib.mkEnableOption "enable restic module";
+    };
+  };
+
+  config = lib.mkIf enabled {
+    services = {
+      restic.backups = {
+        "sync" = {
+          initialize = true;
+
+          user = "alex";
+
+          passwordFile = "/home/alex/backup/restic/password.file";
+          environmentFile = "/home/alex/backup/restic/aws.env";
+          repository = "s3:https://s3.eu-north-1.amazonaws.com/restic-sync-backup";
+
+          paths = ["/home/alex/backup/sync"];
+
+          timerConfig = {
+            OnCalendar = "daily";
+            Persistent = true;
+          };
+
+          pruneOpts = [
+            "--keep-daily 2"
+            "--keep-weekly 7"
+            "--keep-yearly 12"
+          ];
+        };
+      };
+    };
+
+    environment.systemPackages = [ pkgs.restic ];
+  };
+}
+