diff --git a/core/java/android/app/backup/BackupTransport.java b/core/java/android/app/backup/BackupTransport.java
index 6adc2e0b9af81..6cfabf0eb981b 100644
--- a/core/java/android/app/backup/BackupTransport.java
+++ b/core/java/android/app/backup/BackupTransport.java
@@ -589,6 +589,11 @@ public class BackupTransport {
             return BackupTransport.this.sendBackupData(numBytes);
         }
 
+        @Override
+        public void cancelFullBackup() throws RemoteException {
+            BackupTransport.this.cancelFullBackup();
+        }
+
         @Override
         public int getNextFullRestoreDataChunk(ParcelFileDescriptor socket) {
             return BackupTransport.this.getNextFullRestoreDataChunk(socket);
diff --git a/core/java/com/android/internal/backup/IBackupTransport.aidl b/core/java/com/android/internal/backup/IBackupTransport.aidl
index 36de52b2ed4e7..6158a7b733ac6 100644
--- a/core/java/com/android/internal/backup/IBackupTransport.aidl
+++ b/core/java/com/android/internal/backup/IBackupTransport.aidl
@@ -239,6 +239,7 @@ interface IBackupTransport {
     long requestFullBackupTime();
     int performFullBackup(in PackageInfo targetPackage, in ParcelFileDescriptor socket);
     int sendBackupData(int numBytes);
+    void cancelFullBackup();
 
     // full restore stuff
 
diff --git a/services/backup/java/com/android/server/backup/BackupManagerService.java b/services/backup/java/com/android/server/backup/BackupManagerService.java
index 77b14ac18742f..b2d1b717b527d 100644
--- a/services/backup/java/com/android/server/backup/BackupManagerService.java
+++ b/services/backup/java/com/android/server/backup/BackupManagerService.java
@@ -3745,28 +3745,25 @@ public class BackupManagerService extends IBackupManager.Stub {
                             }
                         } while (nRead > 0 && result == BackupTransport.TRANSPORT_OK);
 
-                        int finishResult;
-
+                        // If we've lost our running criteria, tell the transport to cancel
+                        // and roll back this (partial) backup payload; otherwise tell it
+                        // that we've reached the clean finish state.
                         if (!mKeepRunning.get()) {
                             result = BackupTransport.TRANSPORT_ERROR;
-                            // TODO: tell the transport to abort the backup
-                            Slog.w(TAG, "TODO: tell transport to halt & roll back");
+                            transport.cancelFullBackup();
+                        } else {
+                            // If we were otherwise in a good state, now interpret the final
+                            // result based on what finishBackup() returns.  If we're in a
+                            // failure case already, preserve that result and ignore whatever
+                            // finishBackup() reports.
+                            final int finishResult = transport.finishBackup();
+                            if (result == BackupTransport.TRANSPORT_OK) {
+                                result = finishResult;
+                            }
                         }
 
-                        // In all cases we need to give the transport its finish callback
-                        finishResult = transport.finishBackup();
-
                         if (MORE_DEBUG) {
-                            Slog.i(TAG, "Done trying to send backup data: result="
-                                    + result + " finishResult=" + finishResult);
-                        }
-
-                        // If we were otherwise in a good state, now interpret the final
-                        // result based on what finishBackup() returned.  If we're in a
-                        // failure case already, preserve that result and ignore whatever
-                        // finishBackup() reported.
-                        if (result == BackupTransport.TRANSPORT_OK) {
-                            result = finishResult;
+                            Slog.i(TAG, "Done trying to send backup data: result=" + result);
                         }
 
                         if (result != BackupTransport.TRANSPORT_OK) {