diff --git a/utils.inc.php b/utils.inc.php
index 7c1c48f..3daf0ad 100644
--- a/utils.inc.php
+++ b/utils.inc.php
@@ -317,7 +317,7 @@ function saveSql($wikiDir, $backupDir)
     return '==== Mysql database saved in '.$backupDir.'/database.sql ==========='. "\n";
 }
 
-function upgradeWiki($srcDir, $destDir, $backup)
+function upgradeWiki($srcDir, $destDir, $nobackup = false)
 {
     $filesToMove = ['actions', 'cache', 'docker', 'docs', 'formatters', 'handlers', 'includes', 'javascripts', 'lang', 'private', 'setup', 'styles', 'templates', 'tests', 'themes', 'tools', 'vendor', 'composer.json', 'composer.lock', 'index.php', 'INSTALL.md', 'interwiki.conf', 'LICENSE', 'Makefile', 'package.json', 'README.md', 'SECURITY.md', 'wakka.basic.css', 'wakka.css', 'wakka.php', 'yarn.lock', 'yeswicli'];
     $defaultExtensions = array_map('basename', array_filter(glob($srcDir.'/tools/*'), 'is_dir'));
@@ -329,7 +329,7 @@ function upgradeWiki($srcDir, $destDir, $backup)
     $sudo = 'sudo -u ' . $user . ' ';
     $wakkaConfig = [];
     require $destDir.'/wakka.config.php';
-    if ($backup === true) {
+    if (!$nobackup) {
         $tmpbackupDir = '/root/yeswiki_backups/'.str_replace(['https://', 'http://', '/?', '/'], ['','','','-'], $wakkaConfig['base_url']);
         if (is_dir($tmpbackupDir)) {
             $output .= 'ERROR: found existing backup in "' . $tmpbackupDir . '" aborting' . "\n";
diff --git a/yeswiki-updater.php b/yeswiki-updater.php
index c6ee83f..2f0228e 100755
--- a/yeswiki-updater.php
+++ b/yeswiki-updater.php
@@ -39,11 +39,11 @@ if ($isRoot) {
         'description'  => 'Update to latest version of stable yeswiki',
         'noValue' => true
       ],
-      'backup' => [
-        'prefix'       => 'b',
-        'longPrefix'   => 'backup',
-        'description'  => 'Save a backup in /root/yeswiki_backups folder before upgrading the yeswiki',
-        'defaultValue' => true
+      'nobackup' => [
+        'prefix'       => 'nobackup',
+        'longPrefix'   => 'nobackup',
+        'description'  => 'Do not save a backup in /root/yeswiki_backups folder before upgrading the yeswiki',
+        'noValue' => true
       ],
       'depth' => [
         'prefix'       => 'd',
@@ -66,7 +66,7 @@ if ($isRoot) {
         try {
             $update = $climate->arguments->get('update');
             $output = $climate->arguments->get('output');
-            $backup = $climate->arguments->get('backup');
+            $nobackup = $climate->arguments->get('nobackup');
             $depth = $climate->arguments->get('depth');
             $matches = searchWikis($path, 'wakka.config.php', $depth);
             if (count($matches) == 0) {
@@ -94,7 +94,7 @@ if ($isRoot) {
                     } elseif ($wiki['RELEASE'] == $version) {
                         $climate->info('Skipping up-to-date wiki '.$wiki['URL']);
                     } else {
-                        $climate->info(upgradeWiki($destDir, $wiki['PATH'], $backup));
+                        $climate->info(upgradeWiki($destDir, $wiki['PATH'], $nobackup));
                     }
                 }
             } else { // show yeswiki list info