2012 MBA I'm at my wits end here. I've searched all around and found similiar threads with power nap not working at ALL but nothing about it not working after performing a restore from backup or reinstall. I reset the PRAM, SMC and made sure the stupid thing was on in preferences. Trying to do the firmware/efi update again didn't work (said not compatible with my machine, i made sure i had the right one downloaded). Nothing seems to work. No longer do I have time machine backups being performed when my machine is asleep and on power. It used to work perfectly... and now, nothing. Don't know what else to do? Why does this have to be so frustrating? Argh.