How to backup (export to file) the predictive T9 dictionary?

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I want to do a factory settings reset (a.k.a. format) on my G2 but I don't want to loose my T9 dictionary (I have words added inside it).

How can I backup the T9 so to be able to import it after the factory settings reset complete?

How to backup (export to file) the predictive T9 dictionary?