Help Publishing IOS w new Mac

I used a friends Mac to publish my last app, but he has since moved. I have a Mac and wondered a few things:

  1. How can I update my app with the new Mac/keychain/etc. without doing it all over again? Is it possible?

If I remember correctly you need the keychain with the original keys and certificates as this contains your “identity”.

Well that sucks.

How can I backup my keychain so it doesn’t happen again?

There is a native MacOS app do manage Keychains, there you create a new one and put all the relevant stuff in. Then you can export this as a file and back it up.