It is also best to BU the entire disk or OS once in a while. There is freeware that will do this, or although the system image backup feature was removed in Windows 8.1, it can be accessed via the Power Shell.
Didn't see one of the easiest full/incremental Windows BU packages there (maybe because it's a file-by-file, not an image backup, but it saved my backside a couple of times (just booted from a cloned drive and cloned it back onto affected partition in a space of a few minutes) - XXCLONE from Pixelab
They have a free (slightly crippled, but very functional) non-commercial and a low-cost full versions of software.
Also, "an ounce of prevention..." :
CryptoPrevent from FoolishTech - free utility in only 350K file that protects against Cryptolocker AND some other malware as well:
Incidentally, due to the way that CryptoPrevent works, it actually protects against a wide variety of malware, not just Cryptolocker! CryptoPrevent is a tiny utility to lock down any Windows OS to prevent infection by the Cryptolocker malware or 'ransomware', which encrypts personal files and then offers decryption for a paid ransom. CryptoPrevent artificially implants group policy objects into the registry in order to block certain executables in certain locations from running. Note that because the group policy objects are artificially created, they will not display in the Group Policy Editor on a Professional version of Windows — but rest assured they are still there!
A 2T+ USB-powered drive(s) for backups and data portability is a no-brainer investment of about $100 per drive and a peace-of-mind lifesaver.
I bought the Nero Platinum suite a long time ago for the Nero Burning ROM software. I use the heck out of their backup software, it's pretty solid, and I can run regular backups to my NAS. However, since most of my personal stuff is either on the NAS or on a Linux machine, I don't get overly concerned with viruses.