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Re: [MMUG] Time Machine

Access Control Lists… They are extra permissions layers for disks, it means the OS can have a more granular level on permissions. They can be disabled on entire disks but it's probably safer to leave them alone on TM disks, since you may want to restore from it at some point :^) There are also SACL's (Service ACL's) & other kinds too, ACL's are probably involved in 10.8's Gatekeeper & maybe the firewall somewhere too.