While backing-up the contacts on your BlackBerry to a SIM card is a great way to ensure you don't lose names, numbers and emails if your handset has to be wiped, it doesn't protect you if you lose the smartphone itself.
With this in mind, it's worth considering backing up your contacts to a PC. This not only means that should you be unfortunate enough to lose your smartphone, you'll have a record of all the names and numbers you need, but if you get you get a new handset, whether replacing a lost BlackBerry or upgrading to a new one, you'll be able to simply plug the device into your PC and quickly copy across all of your data. Here's how.
Make sure BlackBerry Desktop Manager is installed on your PC. If its not, in can be downloaded from BlackBerry's website.
Now connect your BlackBerry to your PC using the bundled USB cable. BlackBerry Desktop Manager should launch automatically. If not, press Start and select the program from the list.
Select the Backup and Restore tab in the software and then press Advanced options.
From here select the contact list, and press Back up.
Next you'll be asked to specify a location for the back-up to be saved to. Once you've done this, the back up will begin.