How to sync two MyCloud at different locations?

NO. Unless you have bought a Gen2 single-bay MyCloud that the European Technical Marketing Manager wasn’t aware was for sale…

See WD: this is what happens when you launch products without proper support: customer confusion ensues…

If there really is a Gen2 Single-Bay MyCloud, then you’re going to need a manual for it, and a support forum, etc…

Sort yourselves out, FFS…