Is it possible to save temporary locally during the work? To avoid too much network traffic and storage-needs?

Yes it is possible. It is recommended to store always on the server, but as long as the default CAD function for “save” is not disabled by the administrator, the users can save locally before sending data to the server.

When happens communication between client and server?

Communication is always triggered by the CAD user.

Do new releases of Aras Innovator or the CAD Connector require modifications of the created data in the database? Do they imply efforts for adapting the installation of Aras Innovator or the CAD Connector?

In generall this is not the case. Since Aras 9.3 it was not necessary to do any data migration to enable a Aras Innovator or CAD Connector upgrade.

Which releases of Aras Innovator and the CAD System are supported by the CAD Connector?

The connector supports the last two major releases of Aras Innovator and the the last three CATIA Releases. The NX connector supports NX 10 and above.