Power Nap is meant to do this - keep stuff syncing, backing up, etc regardless of lid state. Now, whether it's smart enough to flush any synchronizations that a

Power Nap is meant to do this - keep stuff syncing, backing up, etc regardless of lid state. Now, whether it's smart enough to flush any synchronizations that are still in progress when the lid is closed or you have to wait a few minutes until it half-wakes-up and does its thing, I'm not sure. Also, I believe by default it's off when a power supply isn't attached. Edit: details on Power Nap - http://support.apple.com/kb/HT5394 http://support.apple.com/kb/HT5394