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There's a backup app called Titanium Backup that allows you to back everything up -
Titanium Backup ? root - Android app on AppBrain
If you wait for the official HTC update that will keep all your data and settings, but installing your own one is a different story all together as you're overwriting what's already on there.
If your phone is only 2 days old, I'd question why you'd want to put Gingerbread on anyway? You'd void the warranty and from my experience, Android is much better with HTCs Sense overlay.
It is doable, it's just not something I'd do with a phone that new.
Since were talking about Gingerbread. When do will HTC release the official 2.3 update?
