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How often does Power Nap check for updates or back up?

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up vote 3 down vote accepted
  • Mail, Contacts, Calendar, Reminders, Notes, Photo Stream, Find My Mac, and iCloud Documents are checked every hour.
  • Time Machine backups are attempted hourly until a successful backup has been completed.
  • Software Updates are checked daily.
  • Mac App Store downloads are checked once a week.

Source: http://support.apple.com/kb/HT5394

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