Can Postman be on-Permise tool.
If cannot be on-permise tool ?
all the information related to the API , where are they stored and how secure are they ?
If you’re asking whether you can replace the Postman Sync server with your own I’m afraid the answer is no.
That being said, you are able to disable the synchronisation and use the app fully offline while creating your own saves/backups using the Postman API.