How to Fix OSX Mountain Lion Time Machine

So as some of you may know I was having a few issues with my 2010 MacBook Pro.  I decided while things were wonky why not upgrade OSX, I mean what else could go wrong?  Well actually not much went wrong the upgrade went fine and I even may have solved some of my hardware issues with an SMC reset, but that’s a story for another day.  The only thing that seemed to really bug me was that Mountain Lion Time Machine would no connect to my Iomega PX4.  I had Time Machine enabled on the device as before but I was getting the following error:

What was really odd is if I went into the preferences and right clicked the disk, the backup would work and I could open all my old stuff, just the hourly would not work.  I also noticed there was no information on the latest or oldest backup so clearly something was messup here with Mountain Lion Time Machine and my PX4.

It seemed after a little time googling there was some options, but as I was reading I decided to try to put some pieces together, so the first thing I did was DISABLED time machine on the PX4.  Then I tried to just mount the TimeMachine Folder to see if that would work and it would not show up in the list of available disks.  What I did ultimately discover for the work around was to mount the PX4 TimeMachine folder using Finder “Connect to Server” as the IP Address.

Once this was done I could click the Mountain Lion Time Machine icon in the dock, select “Backup Now” and it worked just fine as you can see below.

Lastly just for kicks I decided to Un-Mount the share so see if Mountain Lion Time Machine was smart enough to re-mount the share, find the sparsebundle and keeping working, and in fact it does.  The only hitch to get this to work seems to be mounting your PX4 by IP Address, picking the TimeMachine Share, and selecting that as the disk in the Mountain Lion Time Machine preferences.  From there it works just fine and all this is still WITHOUT the Time Machine option in the PX4 actually enabled.  I suspect that a firmware update is needed from Iomega to get the native function to work again.

Lastly in all my efforts I did try deleting everything so I did lose all my old backups in the process while I thought it was a sparsebundle issue between Lion and Mountain Lion.  Hopefully this helps you avoid that and you should still see all your old backups in Mountain Lion Time Machine when you get it working.  I hope this helps!

About Chris Colotti

Chris is active on the VMUG and event speaking circuit and is available for many events if you want to reach out and ask. Previously to this he spent close to a decade working for VMware as a Principal Architect. Previous to his nine plus years at VMware, Chris was a System Administrator that evolved his career into a data center architect. Chris spends a lot of time mentoring co-workers and friends on the benefits of personal growth and professional development. Chris is also amongst the first VMware Certified Design Experts (VCDX#37), and author of multiple white papers. In his spare time he helps his wife Julie run her promotional products as the accountant, book keeper, and IT Support. Chris also believes in both a healthy body and healthy mind, and has become heavily involved with fitness as a Diamond Team Beachbody Coach using P90X and other Beachbody Programs. Although Technology is his day job, Chris is passionate about fitness after losing 60 pounds himself in the last few years.


  1. I have exactly the same issue on my 2010 Mac Book Pro with Mountain Lion, however what is interesting is TimeMachine on the Iomega PX4 works perfectly with my 2011 Mac Book Air and Mountain Lion. This issue seems directly related to the MBP….

  2. “What was really odd is if I went into the preferences and right clicked
    the disk, the backup would work and I could open all my old stuff”

    I for the life of me don’t understand what you mean by this unclear sentence. If you mean you went into the menu for Time Machine and chose Open Time Machine Preferences, then what do you mean by “right clicked the disk”? I tried right-clicking everything on the drop-down menu and nothing offered me an option. If you meant something else you are not writing clearly.

    • I wonder if he misspoke. If his situation was like mine, he may have meant to say that he went into Time machine and could see some backups that were there. This solution worked for me to connect to my Iomega personal cloud edition. Kudos Chris.

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