How to Make A Backup Of Contacts On Blackberry Messenger?

I present a brief explanation of how to keep out of harm 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 them. 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 information

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