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I have just installed Windows 7 and now my computer won't wake from hibernate for nightly backups from Windows Home Server. As soon as I turn it on the morning it will backup then. It was running with no problems on Vista and I haven't changed any other settings in the bios and things. I found on the network adapter in bios that there was an option to allow this device to wake the computer, I have checked that but it still won't wake. Is there anything that I can do? I have seen other questions similar to this on here but non had a useful answer.

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This will be patched in WHS powerpack 3, out in 14th December, according to the release notes. You may be able to get the Beta still, which solves the problem - see here:

Windows 7 client PCs will not automatically wake up to do a backup: Windows 7 users can work around this by doing manual backups, or also by turning on the wakeup timer in the Windows client Control Panel. Power Pack 3 beta also fixes this issue.

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No Sleep "is a command line tool that disables sleep or hibernate, runs a batch file or program and then enables sleep or hibernate again. It will run on any recent version of Windows."

Haven't tried it myself- yet. But I'll use it to enable my morning alarm.

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See this article:
Wake up your computer from standby or hibernation, perform an action, and send it back. Automatically.

It describes a freeware named WakeUpFromStandby, available for Vista (which might still work on Windows 7):

Can restore almost every Windows-based operating system from a Stand-by mode (and some from hibernation) that support ACPI (Advanced Configuration and Power Interface) (For support check computer's BIOS as well as Control Panel -> Power Options);

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