For years we had to convince clients that backups are necessary.
Usually we had to wait till a hard drive with important data on it died.
Now, with the spreading of CryptLocker, things changed. You can simply show 2-3 articles to a client and he'll ask how he can backup the data so it's safe.
CryptoLocker proved encrypting data and holding the key for ransom is a economically viable business, so expect a lot more of these type of ransomware to pop up. BitCrypt is an example.
And to answer the OP: if the program did it's job, you cannot decrypt your files unless you pay.
So your options are:
1. restore from backups
2. recreate your data
3. pay the ransom