FileSphere performs automatic versioning as you work by applying major (e.g. 1.0, 2.0, 3.0) and minor versions (e.g. 0.1. 0.2, 1.1,1.2, 1.3...). 

A new minor version is created each time a document is edited and returned to its document space. A new major version is created when documents are Finalized (published) and replaces the last minor version. This major version of the document remains as a read only version and any changes you make to it will be saved under the next minor version number. 

Previous versions are read  only documents, which  can be opened; saved as new documents; and deleted/restored.

  When a document is opened it is placed in your workspace and editing and saving does not increment the version number. A new file version is created only when the document is returned to its document space.

View version details in Windows Explorer

View version details in Microsoft Office

Microsoft Office version details + comment