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Using Time Machine (Lion 10.7.3) [ EDIT: or 10.7.2 see my comment below ] with an Airport Extreme and Western Digital MyBookLive NAS seems to work well but then fails about once a month with the following error:

enter image description here

and then all the backups are corrupt and need to be recreated.

Any suggestions on how to get it to work?

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Are you still having issues with this? Have you started a new backup or are still letting this periodic check go uncorrected? – bmike Feb 24 '12 at 13:53
I submitted this to Apple Bugs about a month ago and was using a USB Time Machine backup instead. I also run Time Machine to the same NAS from a desktop Mac and it has been running flawlessly for a year. It seems it is due to some waking misbehavior of the 2011 MBAir. A recent firmware update from Apple related to this may help. – keithhuss Feb 25 '12 at 17:03

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