I've just realized that on my NAS (WD My Book Live 3 TB version), after BTSync is installed and is running, my NAS unit almost (or never) enters sleep mode. Could it be that the btsync daemon running in the background prevents the system from entering sleep mode ? This could lead to shortened hardware life, and isn't a good practice in general. What are possible workaround for this ? How about giving an option for btsync to throttle/pause when there is no activity(transfer in/out) after x minutes, so that the system can sleep for a while ?