If You may see messages in other apps that there is "No space left on device" but you see a message have enough disk space .. it may be that Crashplan is issuing too many inotify watches -- other . Some processes may report "No space left on device, the solution can be found " when this happens. there is a possible work-around for this in Amahi [https://bugs.amahi.org/issues/2091 Bug # 2091].