New day, new app in Cydia: SecureContacts. This app will allow you to export all your contacts to a secure server and export them at any time as a CSV file.
During the export process, you can also add a password that will protect your file. You can download the file in .csv form from their servers at any time and this app might be useful if you need to restore your iPhone on another computer and you don’t have your contacts synced with Adress Book.
Remember that you can manually backup your entire iPhone ( including contacts ), and you don’t need to use a server, and upload sensitive data to an unknown location.
You can find SecureContacts for free in Cydia via BigBoss repo.