The close reason I chose is:

> Questions should demonstrate reasonable business information
> technology management practices. Questions that relate to unsupported
> hardware or software platforms or unmaintained environments may not be
> suitable for Server Fault

Taking advantage of a "tech support mode" on a NAS box to install third-party software in an un-supported fashion does not classify as a reasonable business information technology practice.

In case you missed it, here's what Code42 has to say:

> Although running the CrashPlan service on a headless computer is an
> unsupported feature, this article describes a process that some users
> have found useful.

While I understand that you are indeed doing this as part of supporting your company, hacking things together like this is not on-topic. We strive to build well-designed, well-supported, reliable systems.