This is the "Backup" tab of the CrashPlan software. This is the first screen you see when you open CrashPlan.
Here you can see the various backup "Destinations" including CrashPlan Central (their online backup service called CrashPlan+) which I'm using, as well as possible Friend, Another Computer, and Folder destinations.
The next section, called "Files," lists the drives, folders, and/or files selected for backup. Any drives or folders listed will show the number of files included within, and all entries show an averaged total size. You can see the Total at the bottom of the list.
The Change... button opens the Change File Selection screen where you choose what data to backup. See the next screenshot for more about that.
Finally, "Inbound" includes various links and settings related to CrashPlan's inbound backup features.