Problem to be solved

At the moment, Audacity "silently" saves the project created in an older version of Audacity without the user being aware of it, which, due to our lack of backwards compatibility, makes it impossible for the user to open the file with an older version of Audacity than the one used to save the project.

Your idea

To show the warning message that would inform the user that saving such a project would make it incompatible with the older versions or, in addition to that, let the user save the project file as a copy.

@LWinterberg @Tantacrul please clarify what should be done here.

Prior art

Additional context

No response