Download CrashPlan for Linux, saving the .tgz archive on your Desktop.
Double-click on the file to open it with Archive Manager, then extract it to the Desktop.
You should have a folder now named 'CrashPlan-install' on your Desktop.
Open the Terminal and navigate to the folder containing the installer. Run the install script, using the default choices:
After it finishes, you need to do three things.
- Edit the .desktop file (to make it compatible with the Unity Launcher).
- Copy it to .local/share/applications.
- Drag it from .local/share/applications onto the launcher.
Edit the .desktop file first:
Add the line 'StartupWMClass=CrashPlan' at the end, so it looks like this:
Save, and exit the text editor. Now move the file:
cp ~/Desktop/CrashPlan-install/scripts/CrashPlan.desktop ~/.local/share/applications
The last part is the easiest. Open your /home folder in Nautilus, and press Ctrl+H to show hidden files.
Now just go to .local/share/applications, grab the icon with your mouse, and drag it to the Unity Launcher.
Credit to @451F 's answer here, which I based this on.