diff --git a/applications/utilities/preProcessing/applyWallFunctionBoundaryConditions/applyWallFunctionBoundaryConditions.C b/applications/utilities/preProcessing/applyWallFunctionBoundaryConditions/applyWallFunctionBoundaryConditions.C
index e44e2910b7..d9164987ff 100644
--- a/applications/utilities/preProcessing/applyWallFunctionBoundaryConditions/applyWallFunctionBoundaryConditions.C
+++ b/applications/utilities/preProcessing/applyWallFunctionBoundaryConditions/applyWallFunctionBoundaryConditions.C
@@ -190,13 +190,12 @@ void replaceBoundaryType
     const_cast<word&>(IOdictionary::typeName) = oldTypeName;
     const_cast<word&>(dict.type()) = dict.headerClassName();
 
-    // Make a backup of the old field
-    word backupName(dict.name() + ".old");
-    Info<< "    copying " << dict.name() << " to "
-        << backupName << endl;
-    IOdictionary dictOld = dict;
-    dictOld.rename(backupName);
-    dictOld.regIOobject::write();
+    // Make a backup of the old file
+    if (mvBak(dict.objectPath(), "old"))
+    {
+        Info<< "    Backup original file to "
+            << (dict.objectPath() + ".old") << endl;
+    }
 
     // Loop through boundary patches and update
     const polyBoundaryMesh& bMesh = mesh.boundaryMesh();
diff --git a/applications/utilities/preProcessing/foamUpgradeFvSolution/foamUpgradeFvSolution.C b/applications/utilities/preProcessing/foamUpgradeFvSolution/foamUpgradeFvSolution.C
index d2e7981c68..9c96a9a4c2 100644
--- a/applications/utilities/preProcessing/foamUpgradeFvSolution/foamUpgradeFvSolution.C
+++ b/applications/utilities/preProcessing/foamUpgradeFvSolution/foamUpgradeFvSolution.C
@@ -84,11 +84,12 @@ int main(int argc, char *argv[])
         }
         else
         {
-            mv
-            (
-                solutionDict.objectPath(),
-                solutionDict.objectPath() + ".old"
-            );
+            if (mvBak(solutionDict.objectPath(), "old"))
+            {
+                Info<< "Backup to    "
+                    << (solutionDict.objectPath() + ".old") << nl;
+            }
+
 
             solutionDict.writeObject
             (
@@ -97,8 +98,8 @@ int main(int argc, char *argv[])
                 IOstream::UNCOMPRESSED
             );
 
-            Info<< "Backup to    " << (solutionDict.objectPath() + ".old") << nl
-                << "Write  to    " << solutionDict.objectPath() << nl << endl;
+            Info<< "Write  to    "
+                << solutionDict.objectPath() << nl << endl;
         }
     }