What does saving contacts to google do?
This is a google phone, you want to try as much as possible to have your contacts in Google, your Calendar in Google. It's really the common sense thing to do if you want to own an Incredible.
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It means, as much as anything, that if you have an issue and have to replace your phone, do a factory reset, or whatever, you don't have to punch all your contacts back in.
Are you asking can you add/delete your contacts and have any restoration be your altered version instead of the one you first sent to Google?