diff --git a/kded/config.cpp b/kded/config.cpp
--- a/kded/config.cpp
+++ b/kded/config.cpp
@@ -185,6 +185,12 @@
         info[QStringLiteral("primary")] = output->isPrimary();
         info[QStringLiteral("enabled")] = output->isEnabled();
 
+        QString replicationSourceHash;
+        if (int sourceId = output->replicationSource()) {
+            replicationSourceHash = m_data->output(sourceId)->hashMd5();
+        }
+        info[QStringLiteral("replicate")] = replicationSourceHash;
+
         QVariantMap pos;
         pos[QStringLiteral("x")] = output->pos().x();
         pos[QStringLiteral("y")] = output->pos().y();
diff --git a/kded/output.cpp b/kded/output.cpp
--- a/kded/output.cpp
+++ b/kded/output.cpp
@@ -310,6 +310,18 @@
             }
             infoFound = true;
             readIn(output, info, control.getOutputRetention(output));
+
+            const QString replicationSourceHash = info[QStringLiteral("replicate")].toString();
+            if (replicationSourceHash.isEmpty()) {
+                output->setReplicationSource(0);
+            } else {
+                for (const KScreen::OutputPtr out : outputs) {
+                    if (out != output && out->hashMd5() == replicationSourceHash) {
+                        output->setReplicationSource(out->id());
+                        break;
+                    }
+                }
+            }
             break;
         }
         if (!infoFound) {