On OS X 10.5 (and maybe later, I’ve not tested it), there’s a slightly annoying Time Machine dialog box that pops up each time a different external drive is plugged in which asks if you want to use it as a Time Machine backup volume, to which I always click ‘no’ (you can set a volume to use from the TM pref pane) – I wanted to kill the dialog so I didn’t accidentally accept it at some point and I found the answer at afp548.com in the post Stop Time Machine from Nagging About Every External Disk by macshome – use the terminal command:
defaults write com.apple.TimeMachine DoNotOfferNewDisksForBackup -bool YES
(you can substitute the YES with NO to turn it back on in the future if required).
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