This is a difficult question to answer without knowing more about your specific situation. Rubrik is a cloud data management company that offers a wide variety of products and services. Their website lists a starting price of $5,000/year for their basic package, but it is likely that you would need to customize your package based on your specific needs.
In general, cloud data management companies are worth quite a bit. For example, Veeam, another popular cloud data management company, was recently valued at $5 billion. However, it is difficult to say how much Rubrik is specifically worth without knowing more about your needs and budget.