When you say cloud what do you mean? A DBA that administers instances hosted on a cloud platform, someone that manages the cloud platform, one of another many types of roles related to cloud computing?

As a DBA that works with both onsite SQL Server \ My SQL instances and cloud hosted instances there is significant differences in what is possible.

Personally if you are a good DBA stick with that an improve your knowledge of what RDBMS system are available in a cloud environment such as Amazons AWS, Azure etc. That way you are more versatile.