Index: includes/files.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/backup_migrate/includes/Attic/files.inc,v
retrieving revision 1.1.2.1.2.2
diff -u -r1.1.2.1.2.2 files.inc
--- includes/files.inc	29 Sep 2008 03:56:05 -0000	1.1.2.1.2.2
+++ includes/files.inc	16 Jan 2009 00:29:34 -0000
@@ -47,6 +47,14 @@
 }
 
 /**
+ * Implementation of hook_exit().
+ */
+function backup_migrate_exit() {
+  // Delete any temporary files generated during this execution.
+  backup_migrate_temp_file('', TRUE);
+}
+
+/**
  * Decompress a file with the given settings.
  *  Also updates settings to reflect new file mime and file extension.
  */
@@ -135,8 +143,11 @@
     return;
   }
   else {
-    $file = tempnam(file_directory_temp(), 'tmp_');
-    $file .= $extension ? ".". $extension : "";
+    $file = tempnam(file_directory_temp(), 'backup_migrate_');
+    if (!empty($extension)) {
+      unlink($file);
+      $file .= '.'. $extension;
+    }
     $files[] = $file;
     return $file;
   }
Index: backup_migrate.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/backup_migrate/backup_migrate.module,v
retrieving revision 1.1.2.25.2.1.2.6
diff -u -r1.1.2.25.2.1.2.6 backup_migrate.module
--- backup_migrate.module	29 Sep 2008 03:56:05 -0000	1.1.2.25.2.1.2.6
+++ backup_migrate.module	16 Jan 2009 00:29:34 -0000
@@ -239,13 +239,20 @@
 }
 
 /**
- * Implementation of hook_cron(),
+ * Implementation of hook_cron().
  *
- * Takes care of scheduled backups.
+ * Takes care of scheduled backups and deletes abandoned temp files.
  */
 function backup_migrate_cron() {
   require_once './'. drupal_get_path('module', 'backup_migrate') .'/includes/schedules.inc';
   backup_migrate_schedules_run();
+
+  // Delete temp files abandoned for 6 or more hours.
+  foreach (file_scan_directory(file_directory_temp(), 'backup_migrate_*', array('.', '..'), 0, FALSE) as $file) {
+    if (filectime($file->filename) < time() - 21600) {
+      unlink($file->filename);
+    }
+  }
 }
 
 /**