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Root What do i need to do?

SMS Backup can be done with an app called SMS Backup and Restore which will do the SMS backups, Call history can be done with this: Call History Backup. You can backup your contacts to gmail by following these steps: http://androidforums.com/desire-hd-...c-desire-g-mail-windows-mail.html#post3069437

Apps are associated with the gmail account so they'll redownload themselves once you've installed the new ROM. You'll lose the data associated with them unfortunately, but there's no way around that.
 
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