On clean install import itorders example.
Navigate back to Teams->myteam you will see the itoders was created.
Change one file (lets say business process) in your itorders example and save
Go back to Team->myteam and select "Import Example"
The itorders example is again shown – select it
Look at the file you changed earlier - it was overwritten by the new itorders example install

I think this should not happen as with small mistake users could lose a ton of work.
This happens also if you by mistake import your custom repository multiple times.

If this is as designed I think at least workbench should warn user that with this operation their work could/will be overwritten.