To backup important files I am using Mozy.
Is an encrypted, setup-and-forget and off-site backup software, so I am protected not only against hardware failure, but also against fire, etc.
Do also versioning, keeping files for 30 days after deleted in your computer.
If you want to try, you can get 2.25 GB for free for life using this promo code:
https://mozy.com/?code=94HW8M
And then click in this sequence:
Products -> MozyHome -> 2 GB of 100% free backup space -> Try It Free
Then fill with your data.
The extra 0.25 GB you receive after run the Mozy backup for the first time.
Hope this help you!