Thanks, Robert!
I realized now that DR site should be in another cloud and on a distance because of the purpose.
DR is being implemented as ASYNC Mirror in InterSystems and I think the network performance/bandwidth is the key.
All you mentioned here is fair enough, thanks.
And what I realize in the end that network bandwidth requirements totally depends on the transactions load of the PRIMARY.
The hardware requirements of DR site is an easier thing - DR site can have the same configuration as PRIMARY.
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