Cloud Bursting
Bursting adds capacity for demand peaks. It may still depend on the primary environment, so it does not by itself demonstrate disaster recovery.
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Hybrid Cloud
A connected datacenter and cloud do not by themselves establish portability. Specify the deployment model and test the capabilities required between them.
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Hybrid Cloud and Multicloud Design
A second cloud does not make a system more available by itself. It adds a boundary, and whether that boundary helps depends on what you put across it.