CrashPlan running on Pi (using Raspbian) had a number of problems:
- The service was not robust and would periodically hang, and require manual intervention to recover; it might have been possible to script this, but not in a clean way as far as I could see.
- It tended to get very slow
- Having to use USB connected discs is worrying - USB connected discs still tend to throw wobblies when used extensively (although most of my misadventures have been when running windows).
- smart disc monitoring doesn't work though usb on Pi as far as I can see
Problems 1 & 2 seem to be primarily dues to running a big java application in a limited memory machine (and on a CPU that isn't too good at running java fast to start with). I've written Java apps on Android and also use another big java app on Raspberry Pi (openhab), and it is not really a good place to be. Also with no commitment from the CrashPlan authors to work at reducing their footprint, things could easily suddenly get even worse with a new release.
So I'm looking to run a baby headless linux box at about 30 watts (before discs are spinning) to host CrashPlan and a few other things I like to have running.