05-15-2009, 06:45 AM
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SMS are not contained on the BB server. They are a carrier function.
But to preserve the messages on the device, go to Messages, press Menu, select Options, select General Options, scroll to "Keep Messages", change it to "Forever".
Be aware, though, that relying on storing them on the device is not probably the best solution. If the free memory on the device (Options > Status > File Free) get low, the data on the device might be deleted by the device.
Alternately, you can save the messages on the device by highlighting each message, pressing Menu, and selecting Save.
Better would be to do daily backup of the device with BlackBerry Desktop Manager to save them to a computer.