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We have three OS X servers set to be backed up every night. Intermittently, the backup script fails to complete with the following error message at the bottom. UAllowSystemSleepAgain: IOPMAssertionRelease failed, err = -536870199 Does anyone have any clue as to what the error message is trying to say? The servers are not set to sleep or to shutdown in any manner. The only power saving feature is to turn off the display after 10min. Thanks for your time, Mac