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10.4: Use Access Control Lists for fine-grained control
Authored by: barrysharp on May 08, '05 01:09:54AM

For ACLs to be truly useful they must be recognized and correctly backed up by utilities such as Retrospect, CCC and SilverLiner. I suspect these utilities don't have this capabilty yet. Anyone know what backup utilities do? Does .Mac Backup by chance preserve/restore ACLs - I would expect it should as it's authored by Apple. However, I notice that the .Mac Backup application wasn't revised with the release of Tiger.

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Regards... Barry Sharp



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10.4: Use Access Control Lists for fine-grained control
Authored by: Dragon76 on May 09, '05 09:40:55AM
For ACLs to be truly useful they must be recognized and correctly backed up by utilities such as Retrospect, CCC and SilverLiner

The included BSD utilities in Mac OS X correctly preserve and restore ACLs. There's no guarantee that the apps you mentioned will ever support anything more. I fail to see how the usability of an already in-place and working operating system feature is dependant on flaky third-party backup solutions.

Did you just upgrade from Mac OS 9? Then I could understand your way of thinking.

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10.4: Use Access Control Lists for fine-grained control
Authored by: sauron1440 on May 10, '05 03:52:53AM

The impression I gathered from the Ars dissemination was that the ACL data would be preserved by most (all?) HFS+ apps, as they use a fairly mature mechanism, the arbitrary metadata forks. I think permissions errors are going to be a little weird for most of the disk utilities, depending on how gracefully the Finder/kernel smacks them around for relying only on UNIX-style permissions. In other words, I would guess your data is safe as far as backup goes, but too much mucking with the ACLs will break most of the current generation of disk utilities.

Then again, this is all conjecture.



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