BlackBerry® Messenger provides you with a few ways to back up and restore your BlackBerry Messenger information, which can include your contacts, profile, and group membership. You can set BlackBerry Messenger to save a backup file of BlackBerry Messenger automatically when your contact list changes, such as when you add or delete a contact. You can also create a backup file manually on your BlackBerry device or on a media card. You might also be able to back up the list of groups that you belong to so that you automatically receive invitations to the groups again when you restore your contact list.
Depending on your organization, you might be able to register some or all of the email addresses that you have associated with your device with BlackBerry Messenger to back up and restore your BlackBerry Messenger contact list over the wireless network automatically. When you set BlackBerry Messenger to back up your contact list over the wireless network, BlackBerry Messenger backs up changes to your contacts, profile, and group membership to a BlackBerry Messenger server that is operated by or on behalf of Research In Motion or its affiliates. If you delete all of your device data or if your device is lost or stolen, you can restore your BlackBerry Messenger contact list over the wireless network.