Each blockchain protocol and consensus mechanism has its own crash or fault tolerance. Generally, the more decentralized nodes that there are in a network, the less prone to disaster the network is.
Should all computing resources in one location that the network is deployed in fails, as long as nodes of the network are running in other locations, and sufficient numbers of those nodes have the right role (e.g. validator node), the overall network will not fail.
If all cloud nodes in all regions fail for some reason due to a global outage, we will work with each service provider to restore services as soon as possible.