diff --git a/docs/input-folder-scheduler-plan.md b/docs/input-folder-scheduler-plan.md
index 4e58564..32b34c8 100644
--- a/docs/input-folder-scheduler-plan.md
+++ b/docs/input-folder-scheduler-plan.md
@@ -26,7 +26,7 @@ Note: the local machine's filesystem root is read-only in this workspace, so abs
 6. [x] Add valid-video detection using extension filtering and `ffprobe`.
 7. [x] Add invalid-file handling that logs the reason and moves files to rejected storage.
 8. [x] Add FFmpeg clipping into `/output/clips/<video-name>/` using 8-second MP4/H.264/AAC segments.
-9. [ ] Add success handling that moves processed source files to processed storage.
+9. [x] Add success handling that moves processed source files to processed storage.
 10. [ ] Add failure handling for FFmpeg or filesystem errors.
 11. [ ] Add unit tests for ordering, invalid-file handling, repeat prevention, and state transitions.
 12. [ ] Add optional FFmpeg integration test for a short fixture.
diff --git a/src/main/java/org/example/videoclips/folder/FolderVideoScanScheduler.java b/src/main/java/org/example/videoclips/folder/FolderVideoScanScheduler.java
index d8278f5..de6e539 100644
--- a/src/main/java/org/example/videoclips/folder/FolderVideoScanScheduler.java
+++ b/src/main/java/org/example/videoclips/folder/FolderVideoScanScheduler.java
@@ -65,6 +65,8 @@ public class FolderVideoScanScheduler {
             log.info("Validated folder video candidate: {}", workingFile.getFileName());
             FolderFfmpegClipper.ClipResult clipResult = clipper.clip(workingFile);
             log.info("Generated {} clips in {}", clipResult.clipCount(), clipResult.outputDirectory().getFileName());
+            Path processedFile = moveToDirectory(workingFile, Path.of(properties.getProcessedDirectory()));
+            log.info("Moved successfully processed source to processed storage: {}", processedFile.getFileName());
             return;
         }
 
diff --git a/src/test/java/org/example/videoclips/folder/FolderVideoScanSchedulerTest.java b/src/test/java/org/example/videoclips/folder/FolderVideoScanSchedulerTest.java
index 4255e87..ce7e9c6 100644
--- a/src/test/java/org/example/videoclips/folder/FolderVideoScanSchedulerTest.java
+++ b/src/test/java/org/example/videoclips/folder/FolderVideoScanSchedulerTest.java
@@ -96,7 +96,7 @@ class FolderVideoScanSchedulerTest {
 
         assertFalse(((AtomicBoolean) scanningField.get(scheduler)).get());
         assertFalse(Files.exists(tempDir.resolve("1.mp4")));
-        assertTrue(Files.exists(tempDir.resolve("working/1.mp4")));
+        assertTrue(Files.exists(tempDir.resolve("processed/1.mp4")));
     }
 
     @Test
@@ -118,7 +118,7 @@ class FolderVideoScanSchedulerTest {
         scheduler.scan();
 
         assertTrue(scheduler.findNextCandidate().isEmpty());
-        assertEquals("video", Files.readString(tempDir.resolve("working/1.mp4")));
+        assertEquals("video", Files.readString(tempDir.resolve("processed/1.mp4")));
     }
 
     @Test
@@ -147,6 +147,18 @@ class FolderVideoScanSchedulerTest {
         assertTrue(Files.exists(tempDir.resolve("working/invalid.mp4")));
     }
 
+    @Test
+    void doesNotOverwriteExistingProcessedSource() throws Exception {
+        Files.writeString(tempDir.resolve("1.mp4"), "new video");
+        Files.createDirectory(tempDir.resolve("processed"));
+        Files.writeString(tempDir.resolve("processed/1.mp4"), "existing video");
+
+        assertThrows(IllegalStateException.class, () -> scheduler(tempDir).scan());
+
+        assertEquals("existing video", Files.readString(tempDir.resolve("processed/1.mp4")));
+        assertEquals("new video", Files.readString(tempDir.resolve("working/1.mp4")));
+    }
+
     @Test
     void failsWhenCandidateCannotBeMovedToWorkingDirectory() throws Exception {
         Path candidate = Files.writeString(tempDir.resolve("1.mp4"), "video");
@@ -189,6 +201,13 @@ class FolderVideoScanSchedulerTest {
             throw new IllegalStateException(ex);
         }
         properties.getFolderScheduler().setRejectedDirectory(rejectedDirectory.toString());
+        Path processedDirectory = tempDir.resolve("processed");
+        try {
+            Files.createDirectories(processedDirectory);
+        } catch (Exception ex) {
+            throw new IllegalStateException(ex);
+        }
+        properties.getFolderScheduler().setProcessedDirectory(processedDirectory.toString());
         return new FolderVideoScanScheduler(properties, validator, clipper);
     }