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About once a month, I get the following message for my time machine backup:

Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you.

I'm guessing that this is because my backup was corrupted and needs to be redone. This is annoying for 2 reasons:

  1. I loose all of my old backups.
  2. It takes several hours to recreate the backup.

I have 2 questions:

  1. Is this common behavior for everyone using time machine?
  2. How can I avoid this?

Could it be the case that closing your laptop during a backup will cause corruption?

share|improve this question
No, that's not common. Closing the laptop should ideally just pause the backup and your MacBook will continue where it left off when you open it again – but I haven't tried that. I would probably start verifying the volume through Disk Utility and checking for errors. Also, try switching to another drive if possible (I know, might not be that easy). – slhck Jun 22 '12 at 20:23
I used diskutility on the backup disk. All looks fine. This is actually the second drive I am using. It works fine for my wife. The first drive also had problems (but I don't think they were related). – Andrew Eisenberg Jun 24 '12 at 6:03
I'm also just wondering if I should give up on time machine. See – Andrew Eisenberg Jun 24 '12 at 6:04

Look at this blog post, it seems that it can solve this problem:

share|improve this answer
Hey Robert, thanks for contributing. The convention on Superuser is that you summarize instructions in your answer. Just providing a link without any explanation is frowned upon. – Isaac Rabinovitch Dec 3 '12 at 22:06
Better than nothing. :-) I'll try this out. Thanks for the link. – Andrew Eisenberg Dec 4 '12 at 4:08

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