Access rights on external usb drives gets reset.

Hi!
I use external usb-drivers for backup. I don´t wont other users on my iMac to access this drives, so I have set the access rights for "Everyone" to *"no access"*.
This works as intended, for a while... But for no reason what so ever, the access rights get´s reset to *"Read & Write"*. This might happen after a day or two..
Anyone experienced the same? Anyone know why this happens, and maybe have a solution to this problem?
Best regards
Geir.

Other users on your iMac can easily right-click on the external hard drive icon, get info and check the "Ignore ownership on this volume". Then everyone can read and write on the backup drive which probably isn't what you want. Theoretically, only users with admin rights can check that box, but there's plenty of ways to circumvent this.
If you want to restrict access more, lauch Disk Utility and create a new Read/Write disk image with encryption on the external drive. This will take some time to create and ask you for a password. I'd recommend a strong password (use the password generator that pops up) and let it be stored in your keychain. This way, Time Machine won't ask you to enter the password to back up or enter time machine. You should write down that password though in case the internal hard drive fails or your home folder (including the keychain) gets corrupted. You will be required to enter the password to do a full restore from Time Machine.
The downside of this is that the other users of your iMac can't use Time Machine at all.
Per default, the Time Machine rights are so that you can only access your own home folder plus the shared and public folder (and other non-standard folders within anyone's home folder as it has no specific access rights). Try logging in from another account or the guest account and see if you can access your user account's backup files in, say /Documents. It should deny access and not even reveal the folder's contents.

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