My Cloud sync

One week ago I installed my WD My Cloud 8T.
I’m now starting setting it, but I have issues in understading what is the best method to syncronize some folders I have on my PC with MyCloud.

I need to make sure that this activity is performed when I’m connected to internet (outside my home lan). I installed WDSync, I set up the 2 folders to be syncronize and it was starting to do it.
After 2 hours the syncronization stopped and now I really don’t know how to restart (it’s completely blocked).

Do you have any idea on how to solve the issue? And do you know other software which are able perform these activities using internet (therefore when the PC and the MyCloud are not under the same network)?
Many thanks
Sauro

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cat0w
USA