Q: Time Machine failing since update to Mountain Lion

For years I have been running Snow Leopard on my iMac, and Time Machine has performed flawlessly in the background. Recently, I have updated to Mountain Lion (10.8.5), and Time Machine has been failing. Specifically, once the backup disk is full, it just tells that TM has failed because there is insufficient space. It is not deleting the oldest backups as it used to, and I have to manually delete backups before it will operate again. At first, I thought it was due to my very old and slow external HDD misbehaving, but I have got a new drive which gives exactly the same problem.

Is this a known bug in ML, and do newer versions of OS X also exhibit this behaviour ?

Posted on Feb 22, 2016 9:16 AM

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Q: Time Machine failing since update to Mountain Lion

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by Eric Root,

Eric Root Feb 23, 2016 8:42 AM in response to CNS
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Feb 23, 2016 8:42 AM in response to CNS

Start with C4 in the 1st linked article.

Time Machine Troubleshooting

Time Machine Troubleshooting Problems
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by CNS,

CNS Feb 24, 2016 2:22 AM in response to Eric Root
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Feb 24, 2016 2:22 AM in response to Eric Root

Yes I've seen that article before, but it didn't help.

My backups are never larger than 70GB and usually a lot smaller, and the backup disk is 1TB, so there should always be scope for deleting old backups. But it doesn't actually delete the old backups as it should, it simply fills up the disk then fails. This never used to happen under Snow Leopard - it worked correctly for almost 6 years.
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Q: Time Machine failing since update to Mountain Lion

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by Eric Root,

by CNS,

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