Schedule When Updates Happen and Automatically Reboot Using Group Policy
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This video will show you how to schedule windows updates using Group Policy.
This is very valuable to set up the update group policy on Windows Server because otherwise if it automatically updates then it will just reboot itself in 48 hours and get an error saying "Your PC needs to restart to finish installing important updates. If you’ve already saved anything, you can restart now. Otherwise, you should take a moment to save your work." .
See http://heresjaken.com/server-2012-r2-automatic-restarting-in-15-minutes/ for more details regarding that.
This will also show you how to manually update your server.
This video was made using a testing environment on Hyper-V and Windows Server Essentials 2012.