diff --git a/src/libsync/discovery.cpp b/src/libsync/discovery.cpp
index b5a563e73..963dc3867 100644
--- a/src/libsync/discovery.cpp
+++ b/src/libsync/discovery.cpp
@@ -84,7 +84,8 @@ void ProcessDirectoryJob::start()
     // Check whether a normal local query is even necessary
     if (_queryLocal == NormalQuery) {
         if (!_discoveryData->_shouldDiscoverLocaly(_currentFolder._local)
-            && (_currentFolder._local == _currentFolder._original || !_discoveryData->_shouldDiscoverLocaly(_currentFolder._original))) {
+            && (_currentFolder._local == _currentFolder._original || !_discoveryData->_shouldDiscoverLocaly(_currentFolder._original))
+            && !_discoveryData->isInSelectiveSyncBlackList(_currentFolder._original)) {
             _queryLocal = ParentNotChanged;
             qCDebug(lcDisco) << "adjusted discovery policy" << _currentFolder._server << _queryServer << _currentFolder._local << _queryLocal;
         }
@@ -1586,6 +1587,7 @@ void ProcessDirectoryJob::processBlacklisted(const PathTuple &path, const OCC::L
         item->_instruction = CSYNC_INSTRUCTION_IGNORE;
         item->_status = SyncFileItem::FileIgnored;
         item->_errorString = tr("Ignored because of the \"choose what to sync\" blacklist");
+        qCInfo(lcDisco) << "Ignored because of the \"choose what to sync\" blacklist" << item->_file << "direction" << item->_direction;
         _childIgnored = true;
     }
 
@@ -1785,6 +1787,7 @@ int ProcessDirectoryJob::processSubJobs(int nbJobs)
             }
             if (_childIgnored && _dirItem->_instruction == CSYNC_INSTRUCTION_REMOVE) {
                 // Do not remove a directory that has ignored files
+                qCInfo(lcDisco) << "Child ignored for a folder to remove" << _dirItem->_file << "direction" << _dirItem->_direction;
                 _dirItem->_instruction = CSYNC_INSTRUCTION_NONE;
             }
         }
diff --git a/test/testlocaldiscovery.cpp b/test/testlocaldiscovery.cpp
index 9ed191c8e..167695f64 100644
--- a/test/testlocaldiscovery.cpp
+++ b/test/testlocaldiscovery.cpp
@@ -17,6 +17,87 @@ class TestLocalDiscovery : public QObject
     Q_OBJECT
 
 private slots:
+    void testSelectiveSyncQuotaExceededDataLoss()
+    {
+        FakeFolder fakeFolder{FileInfo{}};
+
+        // folders that fit the quota
+        fakeFolder.localModifier().mkdir("big-files");
+        fakeFolder.localModifier().insert("big-files/bigfile_A.data", 1000);
+        fakeFolder.localModifier().insert("big-files/bigfile_B.data", 1000);
+        fakeFolder.localModifier().insert("big-files/bigfile_C.data", 1000);
+        fakeFolder.localModifier().mkdir("more-big-files");
+        fakeFolder.localModifier().insert("more-big-files/bigfile_A.data", 1000);
+        fakeFolder.localModifier().insert("more-big-files/bigfile_B.data", 1000);
+        fakeFolder.localModifier().insert("more-big-files/bigfile_C.data", 1000);
+        QVERIFY(fakeFolder.syncOnce());
+        QCOMPARE(fakeFolder.currentLocalState(), fakeFolder.currentRemoteState());
+
+        // folders that won't fit
+        fakeFolder.localModifier().mkdir("big-files-wont-fit");
+        fakeFolder.localModifier().insert("big-files-wont-fit/bigfile_A.data", 800);
+        fakeFolder.localModifier().insert("big-files-wont-fit/bigfile_B.data", 800);
+        fakeFolder.localModifier().mkdir("more-big-files-wont-fit");
+        fakeFolder.localModifier().insert("more-big-files-wont-fit/bigfile_A.data", 800);
+        fakeFolder.localModifier().insert("more-big-files-wont-fit/bigfile_B.data", 800);
+
+        const auto remoteQuota = 600;
+        QObject parent;
+        fakeFolder.setServerOverride([&](QNetworkAccessManager::Operation op, const QNetworkRequest &request, QIODevice *outgoingData) -> QNetworkReply * {
+            Q_UNUSED(outgoingData)
+            if (op == QNetworkAccessManager::PutOperation) {
+                if (request.rawHeader("OC-Total-Length").toInt() > remoteQuota) {
+                    return new FakeErrorReply(op, request, &parent, 507);
+                }
+            }
+            return nullptr;
+        });
+
+        QVERIFY(!fakeFolder.syncOnce());
+
+        fakeFolder.syncEngine().journal()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncBlackList, {"big-files-wont-fit/", "more-big-files-wont-fit/"});
+        fakeFolder.syncEngine().setLocalDiscoveryOptions(LocalDiscoveryStyle::DatabaseAndFilesystem, {"big-files-wont-fit/", "more-big-files-wont-fit/"});
+
+        QVERIFY(fakeFolder.syncEngine().journal()->wipeErrorBlacklist());
+        QVERIFY(fakeFolder.syncOnce());
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_B.data"));
+
+        fakeFolder.syncEngine().journal()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncBlackList, {"big-files-wont-fit/", "more-big-files-wont-fit/", "big-files/"});
+        fakeFolder.syncEngine().journal()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncWhiteList, {"more-big-files/"});
+        fakeFolder.syncEngine().setLocalDiscoveryOptions(LocalDiscoveryStyle::DatabaseAndFilesystem, {"big-files/", "more-big-files/"});
+
+        QVERIFY(fakeFolder.syncOnce());
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_B.data"));
+
+        fakeFolder.syncEngine().journal()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncWhiteList, {"big-files/", "more-big-files/"});
+        fakeFolder.syncEngine().journal()->setSelectiveSyncList(SyncJournalDb::SelectiveSyncBlackList, {"big-files-wont-fit/", "more-big-files-wont-fit/"});
+        fakeFolder.syncEngine().setLocalDiscoveryOptions(LocalDiscoveryStyle::DatabaseAndFilesystem, {"big-files/", "more-big-files/"});
+
+        QVERIFY(fakeFolder.syncOnce());
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(fakeFolder.currentLocalState().find("more-big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("big-files-wont-fit/bigfile_B.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_A.data"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("more-big-files-wont-fit/bigfile_B.data"));
+    }
+
     // Check correct behavior when local discovery is partially drawn from the db
     void testLocalDiscoveryStyle()
     {