Thanks for your post.
Based on my research, I also found many similar issues in the past.
It is still not clear about the root cause. But based on resovled cases, incorrectly formatted drive would be the possible cause. Please move/copy exchange data/log into
another drive, and then perform the backup, see if the issue still persists. If not, please format the problematic drive.
Please disable the anti-virus software on the problematic node, and see if the issue still persists.
"Betest" can help you to narrow down the cause. If log files can be deleted after using Betest, this indicates the cause to windows server backup rather than Exchange.
(BETest Tool http://msdn.microsoft.com/en-us/libr...21(VS.85).aspx
More information: http://social.technet.microsoft.com/...9-1a1211722476
Hope this helps.
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