The idea behind mixed-cloud environments is okay, as long as there is a good backup plan in place for the sensitive data that is stored locally. A fire, flood, server drive corruption, or malicious deletion or theft by a disgruntled employee can result in sensitive data being destroyed or released publicly.
By keeping the not-so-sensitive data securely stored in the cloud, and keeping sensitive company data stored on local servers, law firms can still handle most of their business in the cloud, thus increasing time management and project management, while keeping the most sensitive data secured away on local servers. Not everyone is ready to completely move everything to the cloud yet, and a mixed-cloud environment may be a good starting point. Keeping the data secure should be the number one priority