Since this feature is still heavily under development, not all your questions can be answered at this time.

Here is what we know right now:

• The DataMiner will be connected to the cloud by a gRPC connection. This uses HTTP/2 and is encrypted by use of TLS.
• Due to the use of HTTP/2, the cloud connection will only work if the DataMiner runs on Windows Server 2016 or higher.
• All the services running in the cloud are connected with each other by use of a NATS Message Bus so the cloud can be scaled easily when needed.
• Normal users accessing the cloud will be authenticated using AzureAD (in current testing phase only DCP accounts can be used) and will only have access to items that have been shared with them.

Information of this answer is no longer valid since development has progressed to an entirely different framework. For accurate information, see Baptiste's answer