Cara Backup Kontak di Blackberry Messenger (BBM)

Well here I am again to explain how to always keep safe your contacts and groups in the BBM (BlackBerry Messenger), and I read in many places (forums, facebook, twitter, etc) who complain about the loss of the same . Then tell them that we have ourselves to blame users for not knowing how to make a backup.
To begin there are several ways to do this, the oldest is through a backup of all

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