look thru this tutorial - https://eltechs.com/crashplan-on-raspberry-pi
It explains how to set up CrashPlan on Raspberry Pi with the emulator. May be it can help))

If it suits here, there is a possibility to set up an automatic backup directly on Raspbian via CrashPlan. Read the article - https://eltechs.com/crashplan-on-raspberry-pi/ (this is not an affiliate link)