I am assuming you are attempting to use Backup Assistance? If so it has a habit of not playing well with a number of smartphones so I suggest you disable BA and sync only with your Google account to simplify things...
After checking your Google email account and make sure the contacts has been synced there, go to Settings / Applications / Manage Applications / All Tabs / Sync Service / Clear Data to disable BA... (This wont delete the account of remove any contacts already synced, it only disables the app from syncing on your device)