This refer to my iMac 27" with Mavericks In preferences/Energy Saver there is a PowerNap option. Text next to the option states So this option being validated one would expect to find recent emails, backups, etc completed in the morning when you wake it from sleep. What I observe is that on wake; TimeMachine immeadiately goes into "preparing backup" email starts collecting email, some of which several hours old This, to me, smells like power nap is not working. Actually this is a pain as having email and Time Machine startup immediately after wake is just a (short) time waster. Anyway of having Time Machine run as it should ? Have email collect mails during the night ?