Before purging data using this plugin, I always back up my data for safety. So far I have never been in a position where I need to roll back to the backed up data because this plugin has been reliable.
The plugin also has a setting for preventing newer data (e.g. within 1 month) from getting deleted, as pointed out to me by the plugin developer.
To me, this plugin is really useful. It's reliable and is well supported by the developer.