Transport files of PI Objects

Hi,

We have developed some interfaces and moved them through CTS+ to Quality and Production system in the past project. Now I would like to take the backup and use these transports for future projects.

I have following queries:

How should I take the backup of transport files from current landscape, maybe just from Development or Quality system?

Since we have used CTS+ for transporting objects, I should look for .tpz files on the server OR any other file format?

Could you please provide the exact path from the Server from which I should copy the transport files?

Please guide me on this.

Thanks,

CJ