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I own a CM9 Motorola Backflip MB300. I'm planning downgrading it and reapplying the stock ROM. To prevent rendering it unusable, I'm going to perform a nandroid backup, but I get two options: "backup" and "backup + ext".

What is the difference?

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    Just a raw guess: Some ROMs use a special partition for App2SD+, called "sd-ext". Most don't. So I often saw errors like skipping sd-ext, or something with "not found". Might be they "outsourced" that from the usual Nandroid backup to avoid irritation with that error. – Izzy Apr 25 '13 at 20:44

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