A Project (also called Test project) is a complete unit that resides completely within one single folder in the file system (all documents and attachments, as well as the database file itself).
Zeta Test uses the file-based database system "VistaDB" as the default multi-user database. In addition, it supports Microsoft SQL Server 2005 or newer as the database system for a project.
In the latter case, only the documents and attachments are stored in the project folder. The Microsoft SQL Server database is located where your database admin stores the database on the SQL server.