I thought you had a Time Capsule for Time Machine Backups awhile ago? Power Nap will make ONE TM backup to catch any changes between the last time TM ran and the time it went to sleep. It works this way on the MacBook Air. You will see in your logs that Power Nap does indeed run every hour while sleeping. This is all done so that you can grab your computer and go without waking it in the morning. The next time you do wake it, even if out of WiFi range, it will have all the updates that occurred overnight.
Your iMac can use Power Nap http://support.apple.com/kb/HT5394 And yes, it was me that gave you support 15 - 18 August 2013 Subject: Time Machine Hard Drive unmount in by Itself? Cheers, Ronni Sent from Ronni's iPad4 > On 10 Jun 2014, at 2:54 pm, Stephen Chape <chap...@bigpond.com> wrote: > > Hi Ronni, > > I have an iMac 21.5 inch Dec 2012. > It is an i7 processor 3.1Ghz > Preferred to use my budget for the higher specs rather than the bigger screen > (even though I would like both). > One of the CONS of being an aged pensioner with regard to spending. > It is an i7 processor 3.1Ghz > > I used to use mains powered drives for Time Machine backups. > But I found a USB drive less obtrusive on my desk and saved one outlet on my > power board. > Also a little less cable clutter. > > I am happy to just stick with the “no sleep” method. > I am used to it now and powering off at night is not an issue either. > I just need to warn any guests that use my iMac (not very often that happens > either). > > >> On 10 Jun 2014, at 1:30 pm, Ronda Brown <ro...@mac.com> wrote: >> >>> So as far as we are aware there are not yet any portable hard drives that >>> have the sleep issue covered ? >> >> As far as I am aware Power Nap will not power on a USB drive. When your Mac >> is plugged into AC power, Power Nap can perform things like Time Machine >> backups to an AirPort Time Capsule and download OS X software updates while >> your Mac sleeps. >> >> Can you Mac use Power Nap? I don't think you have mentioned what Mac you are >> using. >> If using an iMac it has to be (Late 2012) and later. >> >> Cheers, >> Ronni >> Sent from Ronni's iPad4 >> >> >>> On 10 Jun 2014, at 12:32 pm, Stephen Chape <chap...@bigpond.com> wrote: >>> >>> Hi Ronni - you must have been the WAMUG member who gave me this info about >>> a year ago. >>> And I thank you for that. >>> I have sleep mode switched off on my iMac since then, so not a problem. >>> >>> However I always power my iMac off each night and power on again in the >>> morning. >>> This does not seem to be a problem as the drive copies that action without >>> ejecting. >>> It just seems to be the sleep mode that is the issue. >>> >>> The issue only loomed again last week when my step son came over from Dubai >>> for a few days. >>> One night he used the iMac and put it to sleep when he finished. >>> Of course when I came into the office later I saw the message on screen and >>> no HD icon. >>> >>> So as far as we are aware there are not yet any portable hard drives that >>> have the sleep issue covered ? >>> >>>> On 10 Jun 2014, at 12:23 pm, Ronda Brown <ro...@mac.com> wrote: >>>> >>>> Hi Stephen, >>>> >>>> Power management in newer Mac products use a VERY LOW POWER sleep mode, >>>> almost to hibernation state. Most external drives can only detect a >>>> connection to a computer when the computer is sending a line level signal >>>> via connection cable. When newer macs enter sleep mode the power is >>>> beneath the threshold level these external devices are capable of sensing. >>>> Therefore, when the computer sleeps, the drive thinks the computer is off >>>> and puts itself to sleep causing improper dismount or self-eject, and of >>>> course generating the message that the device has been improperly ejected. >>>> And Yes, this can damage files. >>>> >>>> What is required when using these devices is to either eject the drive >>>> manually through the Finder Window, and then let your computer sleep, or >>>> adjust your power management setting in System Preferences - "Energy >>>> Saver" tab to "NEVER" for the 'Computer Sleep' setting. Also in the same >>>> Energy Saver window, be certain to UNCHECK 'Put hard disks to sleep >>>> whenever possible," and UNCHECK 'Enable Power Nap.' >>>> >>>> Many external drives have their own power management features as well, >>>> that can be set from its own settings window and these operate >>>> independently of OS X. If these devices are set for a sleep mode before OS >>>> X sleeps, it will cause itself to eject improperly from the OS and you >>>> will get error messages and possibly corrupt data and or your backup. >>>> Where these devices offer power management settings, it is advisable to >>>> disable any sleep settings. >>>> >>>> Until all of the manufacturers catch up with ultra low power connection >>>> discovery, it is highly recommended that you manually eject your drive >>>> through OS X Finder prior to any time you plan to let your computer sleep, >>>> or before you turn it off. >>>> This should be rule of thumb for any external storage devices connected to >>>> a Mac >>>> >>>> Cheers, >>>> Ronni >>>> Sent from Ronni's iPad4 >>>> >>>> >>>>> On 10 Jun 2014, at 10:36 am, Stephen Chape <chap...@bigpond.com> wrote: >>>>> >>>>> Hi folks …. FYI >>>>> >>>>> I emailed Imation to ask if any of their portable external drives had >>>>> been configured yet to handle the later Mac’s low powered sleep mode. >>>>> They eject when Mac is in sleep mode. >>>>> >>>>> Following is their reply and my response to their reply. >>>>> >>>>> >>>>>> Dear Stephen, >>>>>> >>>>>> >>>>>> Thank you for taking the time to contact our Technical Support >>>>>> Department. >>>>>> Regarding your inquiry, we don't have any device that has the ability to >>>>>> change this feature. Unfortunately, when your computer goes to sleep >>>>>> mode, >>>>>> our devices to to Sleep mode as well. >>>>>> >>>>>> Therefore, when the computer wakes up, it doesn't have enough energy to >>>>>> wake >>>>>> up the unit and you need to unplug it and plug it back in to use it >>>>>> again. >>>>>> In this case, we don't have any information to fix this problem since the >>>>>> issue is with the power on the computer. >>>>>> >>>>>> I hope you find this information useful. If you require any more >>>>>> assistance, >>>>>> please feel free to contact us back. We'll be glad to assist you. >>>>>> >>>>>> Best regards, >>>>>> >>>>>> Brian Aguilar >>>>>> Technical Support Specialist >>>>> >>>>> >>>>> Hello Brian, >>>>> >>>>> Thank you for your prompt reply regarding this matter. >>>>> I was told about 12 months ago by other members of my Mac Users Group >>>>> that portable HD manufacturers had not yet caught up with Apple’s low >>>>> powered sleep technology. I thought that Imation may have moved forward >>>>> by now. >>>>> >>>>> I therefore consider the issue to be with Imation and not with Apple ! >>>>> >>>>> Thank you once again for your prompt reply. >>>>> >>>>> On 10 Jun 2014, at 1:44 am, Imation Support <techsupp...@imation.com> >>>>> wrote: >> -- The WA Macintosh User Group Mailing List -- >> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> >> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> >> Settings & Unsubscribe - >> <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> > > > Regards, > Stephen Chape > > Mac by choice > Windows because my employer knew no better > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
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