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From the help file in Link


You can restore a backup file that you created from your BlackBerry device running BlackBerry 10 OS or from your BlackBerry smartphone running BlackBerry Device Software 5.0 or later.

On your computer, open BlackBerry Link.
At the bottom of the screen, click your device.
Click the icon.
In the Settings view, in the left pane, click Restore Data.
Click Restore from backup file.
Do one of the following:
To restore all of the data in a backup file to your device, click a backup file.
To restore specific data in a backup file to your device, click a backup file. Clear the Restore all data checkbox. Select the checkbox beside one or more databases that you want to restore.
To restore data from a backup file that is not listed, click Open another backup folder. Navigate to the .bbb file or .ipd file. Click OK.
Click Restore Data.
Tip: To restore your device data, you can also click beside your device at the bottom of your screen. Click Restore.