@denbesten @PeterHainz @RRoach
It not quite as simple as Multi-zones or Multiple regions, one should also consider the type of storage systems applied i.e. whether they are a direct connection and associated with one particular region or in some cases zones as well. In some circumstances, the organisations may have opted for the cheapest options possible, so an examination of the critical services should be undertaken as well. Often organisations may have opted for the cheapest options whether they are public cloud or private cloud, and may not have fully considered from a risk management perspective, whether or not they should be using Cloud Object storage rather then direct. In some cases, Cloud Object storage may be more economical and perhaps provided within a private cloud scenario due to added security services and the fact that the Cloud Provider provides greater support.
Also consider whether the services you currently have are based on bare metal, public or private cloud requirements.
Also I suggest weigh up the Cloud Providers Shared Responsibility Model as well, and identify your own responsibilities vs what they will do for you when you really need them, especially when you find out its your responsibility and theirs is only best efforts.
As @denbesten states AWS went down three times in North America during December 2021 alone, and Azure is also tarnished as well, so perhaps consider a hybrid cloud approach to meet your organisations DR requirements let alone regulatory requirements.
A risk management assessment may also be required to consider the the current circumstances too.
Regards
Caute_Cautim
