application log, security log, system log
.evt
When you select "Clear All Events", you will be prompted by Event viewer to save.
Administrative Events log
Before you clear the event viewer you can go to the "Action" tab and "Save Log File AS.." to save the log file for later viewing.
Application
Open Event Viewer. Open another instance of Event Viewer and open the saved log file. Then you can view them side by side.
no event viewer
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To create a log archive, follow these steps:Start Event Viewer, then select the log to be archived from the Log menu.Select Save As from the Log menu.In the Save As dialog box, select a directory and a log file name.Select a log format using the Save As Type drop-down list box.Choose Save.
the system log record (page 698)