Seen this too
I've seen this exact problem. I'd have to do a complete copy with ACLs turned off, then restore that again to the main drive so that I knew it had no corrupted ACLs. Then I'd have to reset all the ACLs manually, then everything would work for awhile, until the same error would creep up.
In the end I gave up on backing up the ACL data, and have a prebackupscript that turns off ACLs, and a post backupscript that turns them back on (using fsaclctl).
I was just losing too much sleep with the files themselves not getting backed up because of this. I also have a cron task that emails me a commanline disk verify everymorning on the backup.
-Preston
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