group

In group policy sleep settings, what is the difference between unattended sleep time and system sleep timeout

I've read the descriptions but can't make out a defining difference between the two and when to use one but not the other.

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leo135Asked:
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Muhammad BurhanManager I.T.Commented:
The difference is if the unattended time is 10 mins so Windows automatically transitions to sleep when the user leaves the computer unattended. If you specify 0 seconds, Windows will not transition to sleep automatically whether any process is running in background or not.
And in typical sleep timeout is for system idle condition, it depends on the processes.
leo135Author Commented:
Thanks for your answer.

I still don't understand:
If I set 'system sleep timeout', why do I need the 'unattended sleep timeout'?
Muhammad BurhanManager I.T.Commented:
A 50GB folder is going to copy from D drive to E drive with no other interrupt (any input) from keyboard or mouse.

Case1: System Sleep Timeout (10 mins)
the background 'copying' process tells the system to don't go to sleep until that finished.

Case2: Unattended Sleep Timeout (10 mins)
system will go to sleep if you don't push interrupt (any input form mouse/keyboard)
that 'copying' process is not considered as the condition in this case.

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Windows Server 2008

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