diff --git a/XMLDB/NumberedBackup.cpp b/XMLDB/NumberedBackup.cpp
index a56a246f..e6f95569 100644
--- a/XMLDB/NumberedBackup.cpp
+++ b/XMLDB/NumberedBackup.cpp
@@ -1,111 +1,109 @@
-/* Copyright (C) 2003-2019 The KPhotoAlbum Development Team
+/* Copyright (C) 2003-2020 The KPhotoAlbum Development Team
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; see the file COPYING.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 #include "NumberedBackup.h"
 
 #include <DB/UIDelegate.h>
 #include <Settings/SettingsData.h>
 #include <Utilities/FileUtil.h>
 
 #include <KLocalizedString>
 #include <KZip>
 #include <QDir>
 #include <QRegExp>
 
 XMLDB::NumberedBackup::NumberedBackup(DB::UIDelegate &ui)
     : m_ui(ui)
 {
 }
 
 void XMLDB::NumberedBackup::makeNumberedBackup()
 {
     deleteOldBackupFiles();
 
-    int max = getMaxId();
-    QString fileName;
-    fileName.sprintf("index.xml~%04d~", max + 1);
+    const QString fileName = QStringLiteral("index.xml~%1~").arg(getMaxId() + 1, 4, 10, QLatin1Char('0'));
 
     if (!QFileInfo(QString::fromLatin1("%1/index.xml").arg(Settings::SettingsData::instance()->imageDirectory())).exists())
         return;
 
     if (Settings::SettingsData::instance()->compressBackup()) {
         QString fileNameWithExt = fileName + QString::fromLatin1(".zip");
 
         QString fileAndDir = QString::fromLatin1("%1/%2").arg(Settings::SettingsData::instance()->imageDirectory()).arg(fileNameWithExt);
         KZip zip(fileAndDir);
         if (!zip.open(QIODevice::WriteOnly)) {
             m_ui.error(QString::fromUtf8("Error creating zip file %1").arg(fileAndDir), i18n("Error creating zip file %1", fileAndDir), i18n("Error Making Numbered Backup"));
             return;
         }
 
         if (!zip.addLocalFile(QString::fromLatin1("%1/index.xml").arg(Settings::SettingsData::instance()->imageDirectory()), fileName)) {
             m_ui.error(QString::fromUtf8("Error writing file %1 to zip file %2").arg(fileName).arg(fileAndDir), i18n("Error writing file %1 to zip file %2", fileName, fileAndDir), i18n("Error Making Numbered Backup"));
         }
         zip.close();
     } else {
         Utilities::copyOrOverwrite(QString::fromLatin1("%1/index.xml").arg(Settings::SettingsData::instance()->imageDirectory()),
                                    QString::fromLatin1("%1/%2").arg(Settings::SettingsData::instance()->imageDirectory()).arg(fileName));
     }
 }
 
 int XMLDB::NumberedBackup::getMaxId() const
 {
     QStringList files = backupFiles();
     int max = 0;
     for (QStringList::ConstIterator fileIt = files.constBegin(); fileIt != files.constEnd(); ++fileIt) {
         bool OK;
         max = qMax(max, idForFile(*fileIt, OK));
     }
     return max;
 }
 
 QStringList XMLDB::NumberedBackup::backupFiles() const
 {
     QDir dir(Settings::SettingsData::instance()->imageDirectory());
     return dir.entryList(QStringList() << QString::fromLatin1("index.xml~*~*"), QDir::Files);
 }
 
 int XMLDB::NumberedBackup::idForFile(const QString &fileName, bool &OK) const
 {
     QRegExp reg(QString::fromLatin1("index\\.xml~([0-9]+)~(.zip)?"));
     if (reg.exactMatch(fileName)) {
         OK = true;
         return reg.cap(1).toInt();
     } else {
         OK = false;
         return -1;
     }
 }
 
 void XMLDB::NumberedBackup::deleteOldBackupFiles()
 {
     int maxId = getMaxId();
     int maxBackupFiles = Settings::SettingsData::instance()->backupCount();
     if (maxBackupFiles == -1)
         return;
 
     QStringList files = backupFiles();
 
     for (QStringList::ConstIterator fileIt = files.constBegin(); fileIt != files.constEnd(); ++fileIt) {
         bool OK;
         int num = idForFile(*fileIt, OK);
         if (OK && num <= maxId + 1 - maxBackupFiles) {
             (QDir(Settings::SettingsData::instance()->imageDirectory())).remove(*fileIt);
         }
     }
 }
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