[dnanian]

Most of our users are successfully backing up with ACLs enabled. There are some combination of ACLs that are causing problems with the Apple-provided API that we used to copy the ACLs. It always manifests itself in this way.

In the vast majority of cases, the ACLs are clearly corrupt on the source (duplicated in a complex pattern, with many inherited groups), but in Glenn's case -- and I guess yours, Preston [I thought you had managed to find the problem] -- the API crashes with a memory error.

ACLs are brand new to OSX in Tiger, and it seems there are cases where the OS doesn't properly handle copying them. Unfortunately, we've been unable to reproduce the situation here, and it's quite rare, so it's difficult to nail down the exact combination of items that causes the API failure... frustrating for you and us, believe me!