Permissions are badly messed up on any disk Time Machine has used to backup

*The Short Version:*
After using an external disk as a Time Machine target, disk permissions are forever and always utterly ignored which causes huge problems when said disk is supposed to share publicly and privately accessible files/folders over the local network.
Said disk is no longer used for Time Machine, but permissions still refuse to work after the "Ignore ownership..." option is disabled, ACL's are cleared, and more.
*The Long Version:*
So, I'm trying to share some folders off of an external disk I temporarily used for a week as a Time Machine backup disk.
Because I have both "public", and private documents on the disk, I need to use disk permissions, to disallow access to some folders. Enabling file sharing works great, except any and every user get full read/write access to everything.
I have another external aswell, which is identical, just it's never been used as a Time Machine target volume, and permissions are obeyed perfectly.
Originally I think the Ignore ownership option was enabled, but the checkbox wasn't showing up on the Get Info panel. After some messing around, I realized it's not displayed if there's a folder called "Backups.backupdb" on the root of the disk.
Now, a few hours later, after renaming "Backups.backupdb" to "Backups.backupdb_OLD", clearing ACL permissions from the disk, unmounting, mounting, restarting file sharing, and lots more, IT STILL IGNORES ANY AND ALL PERMISSIONS?!
Is there some kinda super secret disk flag option or something I'm missing which causes OSX to still ignore permissions no matter what?
I hope someone here knows what's going on, 2 hours of Googling hasn't helped at all.

UPDATE
I seem to have gotten file sharing to obey the permissions, to some degree. It included removing the share from system preferences, using TinkerTool System to change the permissions to anything (didn't seem to work via normal Finder, as I'd already tried that), and then adding the volume back in sharing preferences.
This doesn't really seem very reliable tho, so I'm hoping someone can come with a technical reason/solution for this.

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    I use Time Machine with an external hard disc which has worked perfectly for some years.  Recently Time Machine has aborted backups if the screen saver starts when back-up is in progress. I use a Maxtor OneTouch4 back-up system.  Any ideas?
    Has Apple recently up-dated my OS (Lion) such that every time the screen saver starts it disables Time Machine.  I have to switch-off the computer and re-start in order to undertake  a back-up.  I have now switched of all screen savers.

    Please read this whole message before doing anything.
    This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
    The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
    Be sure your Mac is shut down.
    Press the power button.
    Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
    Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
    Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
    Test while in safe mode. Same problem(s)?
    After testing, reboot as usual (i.e., not in safe mode.)

  • HT3275 Time Machine not deleting oldest backups when the disk is full

    Time Machine not deleting oldest backups when the disk is full

    Unfortunately, when this happens, Time Machine cannot erase enough space to create room for the new backup. Your options now are:
    1) Add a new Time Capsule or a hard drive to the USB port on the existing Time Capsule and continue with backups
    2) Manually delete backups from Time Machine....which is a long and tedious process.  After a few hours, not much space will be reclaimed and it will not be long before the Time Capsule is full again
    3) Erase the Time Capsule....if you really do not need all the old backups from months ago....and start over with a new Time Machine backup and move forward again

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