My mid 2012 iMac 27" with Mavericks sometimes won't sleep. Its screen is light up in the morning and I'm still logged in. Energy settings: enter image description here

pmset shows:

Last login: Wed Jan 22 23:08:58 on ttys000
renes-imac:~ rene$ pmset -g
Active Profiles:
AC Power        -1*
Currently in use:
 hibernatemode        0
 halfdim              1
 womp                 1
 networkoversleep     0
 sleep                20 (sleep prevented by coreaudiod, backupd, backupd)
 Sleep On Power Button 1
 ttyskeepawake        1
 hibernatefile        /var/vm/sleepimage
 autorestart          0
 disksleep            10
 displaysleep         15

I am running Windows 8.1 in Parallels 9. But that's always running. So I doubt it's Windows fault. Is there anything I can do to analyze why it did not sleep?


backupd is most of Time Machine. I think your computer is constantly backing up over a slowish network link such as WiFi.

I suspect that you have a large amount of file changes every day. Is the Windows image you are running in in Parallels being backed up? That could do it? Go into System Preferences > Time Machine and click on Options...

This will allow you to exclude your image files from Time Machine.

If that doesn't work turn off Time Machine for a couple of days and see if the computer sleeps.

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