diff --git a/htdocs/admin/tools/export_files.php b/htdocs/admin/tools/export_files.php
index 0b9272c2418..36be1f273ff 100644
--- a/htdocs/admin/tools/export_files.php
+++ b/htdocs/admin/tools/export_files.php
@@ -137,7 +137,7 @@ $dirtocompress = basename($fulldirtocompress);
 
 if ($compression == 'zip') {
 	$file .= '.zip';
-	$excludefiles = '/(\.back|\.old|\.log|[\/\\\]temp[\/\\\]|documents[\/\\\]admin[\/\\\]documents[\/\\\])/i';
+	$excludefiles = '/(\.back|\.old|\.log|\.pdf_preview-.*\.png|[\/\\\]temp[\/\\\]|documents[\/\\\]admin[\/\\\]documents[\/\\\])/i';
 
 	//var_dump($fulldirtocompress);
 	//var_dump($outputdir."/".$file);exit;
@@ -173,7 +173,7 @@ if ($compression == 'zip') {
 
 	// We also exclude '/temp/' dir and 'documents/admin/documents'
 	// We make escapement here and call executeCLI without escapement because we don't want to have the '*.log' escaped.
-	$cmd = "tar -cf ".escapeshellcmd($outputdir."/".$file)." --exclude-vcs --exclude-caches-all --exclude='temp' --exclude='*.log' --exclude='documents/admin/documents' -C '".escapeshellcmd(dol_sanitizePathName($dirtoswitch))."' '".escapeshellcmd(dol_sanitizeFileName($dirtocompress))."'";
+	$cmd = "tar -cf ".escapeshellcmd($outputdir."/".$file)." --exclude-vcs --exclude-caches-all --exclude='temp' --exclude='*.log' --exclude='*.pdf_preview-*.png' --exclude='documents/admin/documents' -C '".escapeshellcmd(dol_sanitizePathName($dirtoswitch))."' '".escapeshellcmd(dol_sanitizeFileName($dirtocompress))."'";
 
 	$result = $utils->executeCLI($cmd, $outputfile, 0, null, 1);