Installing Crashplan 7.0 on a supported Linux system is relatively simple. Just follow the instructions on https://support.code42.com/Administrator/Small_Business/Get_started_with_CrashPlan_for_Small_Business/Download_and_install_CrashPlan_for_Small_Business
Essentially just login to your dashboard from there, then:
> tar xvf CrashPlanSmb_7.0.<something>_Linux.tgz
> cd crashplan-install/
> sudo ./install.sh
and follow the instructions.