You don’t need large system drive, just any drive connected (like USB) or even on the network. Hold Alt (Option) when starting the Photo app to invoke a dialog

You don’t need large system drive, just any drive connected (like USB) or even on the network. Hold Alt (Option) when starting the Photo app to invoke a dialog where you can select custom photo library location. You can have multiple photo libraries in different locations and switch between them during Photo app start. https://support.apple.com/guide/photos/create-additional-libraries-pht6d60b524/mac https://support.apple.com/guide/photos/create-additional-lib...