Currently the enterprise edition has a feature that lets you define which external file repositories the team can use and also adjust Google Doc share settings. You can allow users to upload files from: Box, Dropbox, Google Drive, Local Storage (computers), YouTube, and/or OneDrive.
It would be useful that some basic functionality similar to this would become part of the business edition so that only the file repositories activated explicitly by an administrator would become available for the end user. For example by adding all of these file repositories as an option that can be enable in the Apps & Integrations.
This would address 2 issues:
1. Simplification of the processes and reduction of training of the end user by limiting options and allowing only the ones that the users already use day to day to store company documents.
2. Make it easier for companies to stay compliant with data privacy requirements by explicitly controlling which file repositories will have company documents and reducing the risks that users will use personal storage to store company documents.