ZenOK is a free antivirus package that includes a commercial online backup tool.
As malware hunters go, ZenOK is extremely easy to use. Launch the program and it starts a quick scan; you're able to launch a full system scan if you like; and there's a screen to see and manage quarantined files, but that's about it. There are no other settings at all. If, like us, you want more control over your antivirus tool then this may make you a little nervous, but if you prefer software that stays out of your way then ZenOK definitely fits the bill.
There's also a System tab that displays the temperature of your hard drive (as long as it supports S.M.A.R.T., presumably).
You get a built-in online backup client, though you'll have to pay to activate this. Prices start at $34 a year for 150GB of online storage.
And according to the ZenOK website, the program also includes real-time antivirus scanning, antiphishing protection, a firewall and more, although again, the lack of options and settings mean there's no way to ensure any of this is configured to suit your needs.