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I recently wiped my Time Capsule and started a new set of backups. After a couple of weeks, Time Machine reported that “to improve reliability”, it needed to start over—again. My understanding is that this is caused by a filesystem error so bad it can't be identified, let alone fixed, so one would have to start anew.

This is all very well, but there doesn't seem to be an option to start backing up again without erasing the existing backup image. I'd like to keep it around for a while.

Is there any way to un-claim a Time Machine backup?

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Starting with mountain lion, I receive these messages, too. I don't think it is a file system error, as it shows every 1-2 month and only since mountain lion. My other macs (10.7 and 10.8) are using the same backup location and haven't had any problem at all. – Purple Tentacle Jan 17 '13 at 19:34
@ComicSans 10.8 is Mountain Lion. That's kind of irrelevant, though. My question is on how to get Time Machine to ignore an existing backup and start a new one for the same machine on the same volume. – Blacklight Shining Jan 18 '13 at 0:32
up vote 1 down vote accepted

I had this a long time ago, so I am not 100% sure that I remember the solution correctly, but I think it was rather simple:

Rename the existing backup image or tuck it away in a folder.

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Moving the image to a subfolder worked. – Blacklight Shining Jan 19 '13 at 9:12

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