How to Upgrade Blackberry OS 5 to OS 6 -
Backing Up Your Devices Main Information Using Desktop Manager*
1. Connect your device to your PC with your USB cable.
2. Open your Desktop Manager software.
3. Click on Backup and Restore and then click Backup
4. Choose the location of where you would like to save the backup file.
5. Click save and wait for the process to finish
6. When finished, it will say the backup was successfully created
Details on http://www.blackberryos.com/blackberry-how-guides/4946-all-one-guide-how-upgrade-your-device-pictures-videos.html