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Time Machine must create a new backup for you.

448 Views 7 Replies Latest reply: Nov 26, 2012 9:53 PM by Jon Hermansen RSS
Joey!! 【ツ】 Level 2 Level 2 (255 points)
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Nov 16, 2012 1:24 PM

I am backing up my rMBP running 10.8.2 to a third gen Time Capsule over Wifi. It has been backing up successfully since I bought it a few months ago. It stopped backing up for 12 days (because I was away from home, so this is expected). During that time I updated to the latest notebook update (MacBook Air and MacBook Pro Update 2.0), which changed the build number to 12C3006. The next time it tried to back up, it performed a deep scan, and stated it had to back up around 8 GB (expected because of the new update). It backed up, but when it was almost completed, I got this message:

"Time Machine completed a verification of your backups on "TC". To improve reliability, Time Machine must complete a new backup for you."

Screen Shot 2012-11-16 at 2.02.47 PM.png

My questions are: Is there a way to figure out what caused this to occur? Is there a way to fix it, or do I have to start a new backup and wipe out all of my backup history? How can I prevent this from occurring in the future?


Thank you!

MacBook Pro (Retina, Mid 2012)
  • LaPastenague Level 7 Level 7 (32,965 points)
  • LaPastenague Level 7 Level 7 (32,965 points)

    As pondini says.. the causes are many and various.. but basically it has corrupted itself.. remember TM is always meant as a current snapshot of the computer.. if you want longer term storage you should use a disk image.


    Wireless is definitely part of the trouble.. more packets are corrupted and sometimes missed I guess.. then TM checks the backup it discovers the corruption but instead of fixing it just starts all over again.


    We do recommend to people if possible use ethernet.. but for laptop users that isn't easy.


    Also it is the setup of the TC in the network.. if you have the TC setup in bridge or as a router that is fine. But if you are trying to transfer packets by double hop wireless that is to be avoided.


    I would also just because Mountain Lion is a bit more difficult on the networking.


    Reset the TC and use all SMB type names.. short, no spaces pure alphanumeric.

    That is for TC itself, wireless.. I recommend different names for 5ghz so you can force connection and the hard disk name.


    Fix and lock wireless as well. All of it can help.. a bit.

  • LaPastenague Level 7 Level 7 (32,965 points)

    If you want to keep the history.. then archive off the TC to USB drive.


    The only trouble is apple left that function out of the new airport utility, so you have to use v5.

  • Jon Hermansen Calculating status...

    I'm having the same issue, Mid-2012 rMBP and a 3rd Gen Time Capsule. Everything is up to date. I have an apostrophe in my Computer Name and have never had an issue with that.


    I'm just trying to figure out how I can modify the .sparsebundle file so I can start a new backup without losing my history. I already figured out how to manually mount and copy files out of the sparsebundle, so not having it as my main backup "file" would be perfect.


    If anyone knows how, feel free to post it here. If I figure it out, I'll do the same


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