diff --git a/modules/system/backups.nix b/modules/system/backups.nix
index f69ebf6..eb07ec5 100644
--- a/modules/system/backups.nix
+++ b/modules/system/backups.nix
@@ -23,10 +23,20 @@ in
 {
   options.modules.system.backups = {
     enable = lib.mkEnableOption "enables backups with borg";
-    baks = lib.mkOption {
+#    baks = lib.mkOption {
 #      type = lib.types.attrsOf ( lib.types.attrsOf (lib.types.listOf lib.types.null) );
+#      default = {};
+#      description = "backup jobs, nested attribute sets should be <bak_name> = paths [<list_of_paths>]";
+#    };
+    baks = lib.mkOption {
+      type = lib.types.attrsOf (lib.types.submodule {
+        options.paths = lib.mkOption {
+          type = lib.types.listOf lib.types.path;
+          description = "Paths to back up for this job.";
+        };
+      });
       default = {};
-      description = "backup jobs, nested attribute sets should be <bak_name> = paths [<list_of_paths>]";
+      description = "Backup jobs (attribute set of name → { paths = [ … ]; })";
     };
     paths = lib.mkOption {
       type = lib.types.list;