Lose photos from change of Apple ID
Will all of my photos be lost if I change the Apple ID on my Mac mini ? For context my son and I were using the same Apple ID so I created a new one .
Mac mini, macOS 12.5
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When changing to the new ID, make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on. There may be some data loss, but you can minimize it. If syncing photos with iCloud, ensure Optimization is turned off in Photos/Preferences/iCloud. Then make sure full resolution photos are on the computer. When signing out of iCloud, if asked whether you want to retain data, choose yes. Messages conversations will be lost if they are addressed to the ID. See the article below for other places that the old ID should be removed. See Winston Churchill's response in the below discussion. If possible, also set up Family Sharing between the IDs to keep access to your apps/purchases.
What to do after you change your Apple ID or password - Apple Support.
How to transfer all files from one iCloud account to another.