bugfix unlimited backup files fails

v2/models/AbstractVm.php

@@ -278,7 +278,7 @@ abstract class AbstractVm extends AbstractObject implements \MGProvision\Proxmox
         $data['storage']  = $storage;
         $data['remove']   = $routing;
         if(is_numeric($maxFiles)){
-            if($maxFiles > 0){
+            if((int) $maxFiles > 0){
                 $data['maxfiles'] = (int) $maxFiles;
             }
         }