iMac with Mavericks sometimes won't sleep 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:


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.