Most every change or entry in the system is logged in the System Log. This is a 'checks and balances' type module that allows you to periodically review the log for any issues, or help you to troubleshoot potential issues. To access the Syste Log, simply click Logs -> System Log
From here, a list of all events logged in the system will be shown. You can easily search for a string or Keyword by inputting the text in the search box. System log entries cannot be deleted and are saved for eternity.
From there, all entries that contain the string will be displayed.