1. Install the following ports:
  2. Add linux_enable="YES" to /etc/rc.conf
  3. Add linproc /compat/linux/proc linprocfs rw 0 0 to /etc/fstab
  4. mount /compat/linux/proc
  5. cd to your CrashPlan-install directory, and then as root, do: /compat/linux/bin/bash
  6. Run ./install.sh. Accept all the defaults except do not start CrashPlan desktop.
  7. Install CrashPlan on a handy Windows/OS X/Linux box and then set it up as a headless client per these instructions.