How to backup BlackBerry Messenger contact list
You can have up to five backup files on your BlackBerry® device or media card.
On the Home screen or in the Instant Messaging folder, click the BlackBerry Messenger icon.
On the contact list screen, press the Menu key.
Click Options.
Click Back Up.
Click Back up files locally.
Change the Save backup files to field to Device or Media Card.
To save a backup file automatically when your contact list changes, select the Auto save contact list changes check box.
Click Back Up Now.
Done
