diff --git a/src/hydra-queue-runner/build-remote.cc b/src/hydra-queue-runner/build-remote.cc
index 4fa9da0c..f9a0483a 100644
--- a/src/hydra-queue-runner/build-remote.cc
+++ b/src/hydra-queue-runner/build-remote.cc
@@ -71,7 +71,7 @@ static void openConnection(const string & sshName, const string & sshKey,
 
 static void copyClosureTo(std::shared_ptr<StoreAPI> store,
     FdSource & from, FdSink & to, const PathSet & paths,
-    TokenServer & copyClosureTokenServer,
+    TokenServer & copyClosureTokenServer, counter & bytesSent,
     bool useSubstitutes = false)
 {
     PathSet closure;
@@ -115,6 +115,9 @@ static void copyClosureTo(std::shared_ptr<StoreAPI> store,
 
     printMsg(lvlDebug, format("sending %1% missing paths") % missing.size());
 
+    for (auto & p : missing)
+        bytesSent += store->queryPathInfo(p).narSize;
+
     writeInt(cmdImportPaths, to);
     exportPaths(*store, missing, false, to);
     to.flush();
@@ -125,13 +128,16 @@ static void copyClosureTo(std::shared_ptr<StoreAPI> store,
 
 
 static void copyClosureFrom(std::shared_ptr<StoreAPI> store,
-    FdSource & from, FdSink & to, const PathSet & paths)
+    FdSource & from, FdSink & to, const PathSet & paths, counter & bytesReceived)
 {
     writeInt(cmdExportPaths, to);
     writeInt(0, to); // == don't sign
     writeStrings(paths, to);
     to.flush();
     store->importPaths(false, from);
+
+    for (auto & p : paths)
+        bytesReceived += store->queryPathInfo(p).narSize;
 }
 
 
@@ -140,7 +146,8 @@ void buildRemote(std::shared_ptr<StoreAPI> store,
     const Path & drvPath, const Derivation & drv,
     const nix::Path & logDir, unsigned int maxSilentTime, unsigned int buildTimeout,
     TokenServer & copyClosureTokenServer, RemoteResult & result,
-    counter & nrStepsBuilding, counter & nrStepsCopyingTo, counter & nrStepsCopyingFrom)
+    counter & nrStepsBuilding, counter & nrStepsCopyingTo, counter & nrStepsCopyingFrom,
+    counter & bytesSent, counter & bytesReceived)
 {
     string base = baseNameOf(drvPath);
     result.logFile = logDir + "/" + string(base, 0, 2) + "/" + string(base, 2);
@@ -188,10 +195,10 @@ void buildRemote(std::shared_ptr<StoreAPI> store,
     }
 
     /* Copy the input closure. */
-    printMsg(lvlDebug, format("sending closure of ‘%1%’ to ‘%2%’") % drvPath % sshName);
-    {
+    if (sshName != "localhost") {
+        printMsg(lvlDebug, format("sending closure of ‘%1%’ to ‘%2%’") % drvPath % sshName);
         MaintainCount mc(nrStepsCopyingTo);
-        copyClosureTo(store, from, to, inputs, copyClosureTokenServer);
+        copyClosureTo(store, from, to, inputs, copyClosureTokenServer, bytesSent);
     }
 
     autoDelete.cancel();
@@ -220,13 +227,13 @@ void buildRemote(std::shared_ptr<StoreAPI> store,
     }
 
     /* Copy the output paths. */
-    printMsg(lvlDebug, format("copying outputs of ‘%1%’ from ‘%2%’") % drvPath % sshName);
-    PathSet outputs;
-    for (auto & output : drv.outputs)
-        outputs.insert(output.second.path);
-    {
+    if (sshName != "localhost") {
+        printMsg(lvlDebug, format("copying outputs of ‘%1%’ from ‘%2%’") % drvPath % sshName);
+        PathSet outputs;
+        for (auto & output : drv.outputs)
+            outputs.insert(output.second.path);
         MaintainCount mc(nrStepsCopyingFrom);
-        copyClosureFrom(store, from, to, outputs);
+        copyClosureFrom(store, from, to, outputs, bytesReceived);
     }
 
     /* Shut down the connection. */
diff --git a/src/hydra-queue-runner/build-remote.hh b/src/hydra-queue-runner/build-remote.hh
index 19625b19..3aa2d919 100644
--- a/src/hydra-queue-runner/build-remote.hh
+++ b/src/hydra-queue-runner/build-remote.hh
@@ -24,4 +24,5 @@ void buildRemote(std::shared_ptr<nix::StoreAPI> store,
     const nix::Path & drvPath, const nix::Derivation & drv,
     const nix::Path & logDir, unsigned int maxSilentTime, unsigned int buildTimeout,
     TokenServer & copyClosureTokenServer, RemoteResult & result,
-    counter & nrStepsBuilding, counter & nrStepsCopyingTo, counter & nrStepsCopyingFrom);
+    counter & nrStepsBuilding, counter & nrStepsCopyingTo, counter & nrStepsCopyingFrom,
+    counter & bytesSent, counter & bytesReceived);
diff --git a/src/hydra-queue-runner/counter.hh b/src/hydra-queue-runner/counter.hh
index 4d6b4163..912cb499 100644
--- a/src/hydra-queue-runner/counter.hh
+++ b/src/hydra-queue-runner/counter.hh
@@ -2,7 +2,7 @@
 
 #include <atomic>
 
-typedef std::atomic<unsigned int> counter;
+typedef std::atomic<unsigned long> counter;
 
 struct MaintainCount
 {
diff --git a/src/hydra-queue-runner/hydra-queue-runner.cc b/src/hydra-queue-runner/hydra-queue-runner.cc
index 9037ee10..79ef3a04 100644
--- a/src/hydra-queue-runner/hydra-queue-runner.cc
+++ b/src/hydra-queue-runner/hydra-queue-runner.cc
@@ -256,6 +256,8 @@ private:
     counter totalStepBuildTime{0}; // total build time for steps
     counter nrQueueWakeups{0};
     counter nrDispatcherWakeups{0};
+    counter bytesSent{0};
+    counter bytesReceived{0};
 
     /* Log compressor work queue. */
     Sync<std::queue<Path>> logCompressorQueue;
@@ -1158,7 +1160,8 @@ bool State::doBuildStep(std::shared_ptr<StoreAPI> store, Step::ptr step,
             /* FIXME: referring builds may have conflicting timeouts. */
             buildRemote(store, machine->sshName, machine->sshKey, step->drvPath, step->drv,
                 logDir, build->maxSilentTime, build->buildTimeout, copyClosureTokenServer,
-                result, nrStepsBuilding, nrStepsCopyingTo, nrStepsCopyingFrom);
+                result, nrStepsBuilding, nrStepsCopyingTo, nrStepsCopyingFrom,
+                bytesSent, bytesReceived);
         } catch (Error & e) {
             result.status = RemoteResult::rrMiscFailure;
             result.errorMsg = e.msg();
@@ -1592,6 +1595,8 @@ void State::dumpStatus(Connection & conn, bool log)
         root.attr("nrStepsBuilding", nrStepsBuilding);
         root.attr("nrStepsCopyingTo", nrStepsCopyingTo);
         root.attr("nrStepsCopyingFrom", nrStepsCopyingFrom);
+        root.attr("bytesSent", bytesSent);
+        root.attr("bytesReceived", bytesReceived);
         root.attr("nrBuildsRead", nrBuildsRead);
         root.attr("nrBuildsDone", nrBuildsDone);
         root.attr("nrStepsDone", nrStepsDone);
diff --git a/src/script/hydra-send-stats b/src/script/hydra-send-stats
index b3e28968..9ef2dce1 100755
--- a/src/script/hydra-send-stats
+++ b/src/script/hydra-send-stats
@@ -44,6 +44,9 @@ sub sendQueueRunnerStats {
     gauge("hydra.queue.builds.finished", $json->{nrBuildsDone});
 
     gauge("hydra.queue.checks", $json->{nrQueueWakeups});
+
+    gauge("hydra.queue.bytes_sent", $json->{bytesSent});
+    gauge("hydra.queue.bytes_received", $json->{bytesReceived});
 }
 
 while (1) {