There are some paid apps now that allow you to sync with an exchange server. But, I'm not sure if this includes contacts. The descriptions only mention email and calendar.
I imagine (but I've not tried this) you can just turn off contacts syncing in Menu -> Data synchronisation, and uncheck Contacts. You can then log into your Google account online and delete all your contacts to remove them from anywhere online. You can still add/remove contacts from your phone, but it won't be backed up anywhere.

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