Sadly, you can't.
Honestly, other then hourly billing, there is no benefit to cloud over traditional hosting unless it includes:
Multiple hypervisor servers, with instant failover.
Redundant SAN/block level storage.
Redundant power and networks to each server.
These are things you cannot tell yourself, and will have to ask the host, and trust their response.
Sadly, most "cloud" hosting plans do not include this level of redundancy and still have single points of failure. If that's the case, there is no benefit to using their "cloud" and your better off with a quality shared hosting.