If you have a Gmail account. Go to www.google.com/contacts and sign in with your account. Start adding each contact. Now when completed, all your contacts will always be saved there, so when you add a Gmail account to your BlackBerry Device, it'll automatically pull all those contacts. Voila, no need for physical backup.
If you have iCloud or Outlook/Hotmail, start doing the same thing there. Once you've added all your contacts, it'll be there for life. If you import account to device, your contacts will sync.
Here's the best part, when you add a contact on device, it'll sync to that service where your pulling contacts from.