\hypertarget{ex6_ex6_overview}{}\section{Overview}\label{ex6_ex6_overview}
Open\+Flipper offers the opportunity to keep track of the changes that were made to an object by different plugins (i.\+e. topological as well as geometrical changes). Hence, every plugin that performs changing actions on meshes should be derived from the \hyperlink{classBackupInterface}{Backup\+Interface} which provides all necessary signals and slots for the handling of backups.

In this tutorial we show the usage of the backup plugin using a simple smoother plugin which performs several iterations of the simple Laplace-\/operator (using uniform weights) on all loaded meshes that are tagged as target. 