What would be needed:

• workspace creation date (could be added to workspaceInfo())
• list a workspace at a given time, similar to workspaceStatEntry() and workspaceStatFolderChildren() with an extra parameter for the datetime
• something to restore a file:
  • either by providing a function that restore a file from an older state
  • or by having workspaceOpenFile and fdRead able to take a datetime
• being able to mount a workspace at a given time to access a file. Since the user may try to open the same file at multiple times and compare them, it would be better if the mountpoints where hidden, or at a different location (opening a file at Date1, Date2 and Date3 would result in three mountpoints).