The Menu bar in Event Viewer reads from left to right File, Action, View, and Help. If the Action and View options are not on the Menu bar click View in the Actions (right hand pane), Customise and check the box before Menu under Snap-in. If you have not got a Menu bar you need the click the third icon (see next paragraph) and use the View option is the Actions pane to create the Menu bar ( Menu under Snap-in) and check the box before Standard Menu there to add Action and View to the Menu bar..
When you select Save All Events Windows Explorer opens a window displaying your Documents library.
Type a name in the File name box and click Save and OK. Type or place the link the https://onedrive.live.com/ in your browser address bar and press ENTER. One Drive opens. Click Upload and a Windows Explorer window opens, click Documents (you may need to expand Desktop>Libraries>Documents), use the scroll to go down the list in the Documents library to locate your named file. Place the cursor on the file and click the Open button. The file then uploads to OneDrive.