You can archive security logs so that you can monitor security events over a period of time. Or you can archive application logs so that you can track the Warning and Error events that occur for specific applications.
When you archive a log file, the entire log is saved, regardless of any filtering options specified in Event Viewer. If you changed the sort order in Event Viewer, event records are saved exactly as displayed if you archive the log in a text or comma-delimited text file.