How does Time Capsule identify Macs backing up towards it

I have acquired a MacBook Air and copied data and settings from my MacBook Pro to it. I have no intention to replace the MacBook Pro, but to use both computers simultaneously. Everything works fine, but when both machines are online in my home LAN and are trying to execute a Time Machine backup to the Time Capsule, I very often get an error from the (old) MacBook Pro that the Time Capsule is busy.
Would there be a possibility that the MacBook Air has somehow herited any kind of ID from the MacBook Pro so they are seen as identical machines from the TIme Capsule?
I have changed the computer name in the sharing settings - is there anything else I should change to make this work?
Kind regards, Stefan

Chamar wrote:
Check the Time Machine Preferences on the MBA and check the setting of the ON/OFF slider.  If you do not want TM to automatically backup from the MBA, set it to OFF.
I run TM manually from my MacBooks to avoid any conflicts on the TC.
Thank you Chamar, I apologize for being unclear in my statement. I am very happy with Time Machine starting automatically, I only would like to know by what criteria a client is identified by Time Machine / Time Capsule. If it is the computer name in Sharing Preferences only, then ok.

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