diff --git a/mod.nix b/mod.nix
index 73599c9..15de45d 100644
--- a/mod.nix
+++ b/mod.nix
@@ -38,6 +38,24 @@ in
       type = with types; listOf path;
       default = [ ];
     };
+    gc = {
+      enable = mkEnableOption "delete old snippets";
+      dates = mkOption {
+        type = types.str;
+        default = "00:00";
+        description = ''
+          Specification (in the format described by
+          <citerefentry><refentrytitle>systemd.time</refentrytitle>
+          <manvolnum>7</manvolnum></citerefentry>) of the time at
+          which the garbage collector will run.
+        '';
+      };
+      maxAge = mkOption {
+        type = types.ints.positive;
+        default = 60 * 24 * 30;
+        description = "maximum age in minutes after which snippets will be garbage collected. Defaults to 30 days";
+      };
+    };
   };
   options.programs.brownpaper = {
     enable = mkEnableOption "brownpaper client";
@@ -72,6 +90,10 @@ in
           User = cfg.user;
         };
     };
+    systemd.services.brownpaper-gc = mkIf (cfg.enable && cfg.gc.enable) {
+      startAt = cfg.gc.dates;
+      script = "${pkgs.findutils}/bin/find ${cfg.dataDir} -maxdepth 1 -type f -mmin +${toString cfg.gc.maxAge} -delete";
+    };
     environment.systemPackages = optionals cfgc.enable [
       (pkgs.writeShellScriptBin "brownpaper" ''
         BROWNPAPER_ENDPOINT='${cfgc.endpoint}' ${(pkgs.callPackage ./. { inherit pkgs; src = ./.; }).client}/bin/brownpaper "$@"