These PDF OS X security guides came out a few months back at http://www.apple.com/support/security/guides/. Although primarily concerned with corporate environments, even a home user can benefit from reading these. I downloaded the Mac OS X Security Configuration Guide (there's another version for Server).
I learned a thing or two here. For example, I didn't know this:
sh-3.2# pwd /Volumes/IOMEGA500/Backups.backupdb/MacBook/2008-09-17-105229/Macintosh HD/Users/tony/Desktop sh-3.2# rm -f *dmg rm: kerio-kms-6.2.0-1255-mac.dmg: Operation not permitted sh-3.2#
So how do you get rid of ALL copies of a file you want to delete? You use Time Machine itself: the little gear icon functions differently here. When you highlight a file and pull down that menu, it has the choice "Delete from all backups".
Another thing I never thought of is using keychains on a portable drive. That's a little extreme for most of us, but if you travel with your system a lot, it might be worth the trouble:
This guide covers things like disabling wifi, bluetooth, usb and firewire support: even a home user might consider doing that for any of those you don't need to use.
It also covers "sandboxing" (see sandbox-exec), encrypting swap files and much more.
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