I would like to see crashplan (http://crashplan.com/) running on the NAS.
Crashplan also offers a headless installation (http://support.code42.com/CrashPlan/Latest/Configuring/Configuring_A_Headless_Client). This would allow to easily backup all files to the cloud.
From http://support.code42.com/CrashPlan/Latest/Getting_Started/System_Requirements the requirements are no meet: 1 GHZ+ x86-64 CPU, 1 GB Memory, glibc, Java, SWT.
Also, from the link you supply:
-Most NAS hardware isn't able to handle high-I/O operations like compression, encryption, and de-duplication, which are essential components of CrashPlan. We strongly recommend directly attached storage for best performance.
-Most NAS cannot back up large amounts of data due to the memory limitations of these devices. However, it may be possible to change these settings.