The default sleep settings in OS X 10.8 (Mountain Lion) cause the Mac to go to sleep while running a backup (either manual or scheduled) or a restore.
The screenshots in these instructions are for a desktop Mac. On a laptop, there are separate Energy Saver tabs for running on battery and on AC power. Backups and restores should be run with the Mac plugged into AC power.
1. Configuring sleep settings for manual backups and restores
Open the energy saver settings from
[System Preferences] >
[Energy Saver]. Ensure that
[Put hard disks to sleep when possible] is not selected:
2. Configuring sleep settings for scheduled backups
Complete the steps under 1. Configuring sleep settings for manual backups and restores and keep the Energy Saver settings window open.
If it is not already known, determine the scheduled backup window for the Mac.
Schedule... button in the Energy Saver settings window. A dialogue is displayed in which you can set the
Mac to wake up before your scheduled backup window. Set the Mac to wake up five minutes before your scheduled backup window on the
correct day and Click
[Computer sleep] slider to set the time to stay awake. This needs to be at least as long as a backup takes.
Start with a setting of one hour and adjust if scheduled backups do not complete.
3. Running manual backups and restores with the
It is also possible to use the OS X
caffeinate command to keep the Mac awake while running a backup or restore.
Open a terminal by navigating to
Run the TSM client with the command:
sudo caffeinate -is dsmj
Proceed with the instructions for running a manual backup or restoring files.