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Even though, there is a command line interface on linux (which has start, stop and, soon, pause options), there seems to be no equivalent feature on windows nor on mac. This feature should be easily ...
+1 for a scriptable way to view the sync status and to pause and unpause. Also, to be able to set time windows where sync should go full speed, and times when it should be throttled back (or the ability to throttle by command line).