Hands-on with CrashPlan: cloud backup for all
We've recently spent a fair amount of time talking about cloud syncing solutions for PCs and mobile devices. In addition to syncing files and data across multiple devices, these services also provide as much off-site backup as most home users need. But power users and businesses often need more control than the typical cloud sync service can offer—whether it’s over what data is backed up and how, which users can use the service, how that data is secured both in transmission and at rest, or any combination of those flavors of control.
For users and system administrators who are less worried about syncing and more worried about keeping their data safe, a cloud backup solution could be the answer, and among cloud backup solutions, CrashPlan is one of the most competitive, both in features and in pricing. For consumers and small businesses, CrashPlan offers a range of versatile and highly configurable products that can back up client data to CrashPlan's cloud servers without requiring users to pay for and maintain their own file servers or network-attached storage devices. Larger businesses and enterprises can also back data up to CrashPlan's cloud, but are given the added option of creating their own on-site backup servers, which should calm security hawks distrustful of using other companies' servers to store important or sensitive data.
CrashPlan basics

Though the details sometimes differ, all versions of CrashPlan operate in the same basic way: using client software installed on the computer you want to back up, you specify what files you'd like to back up and where you'd like to back them up to. All versions of CrashPlan can use CrashPlan's hosted servers, but other versions can also back up to locally hosted CrashPlan servers, external drives, or even other client computers. Once backed up, you can use the client to restore files and folders to your system.
from Ars Technica http://arstechnica.com/information-technology/2012/05/crashplan-is-cloud-back...