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I have a new mac mini m1 with 256 internal storage. i have a thunderbolt 3 nvme 2tb external drive. I would like to run the lightoom library and smart previews off the external drive to save space on the internal. How do i do that?
You can store a copy of the Originals on an external drive, but the Library and a copy of the Smart Previews can only be stored locally:
https://helpx.adobe.com/uk/lightroom-cc/using/preferences.html#LocalstoragepreferencesOne option is to set the cache to a lower number, this will keep less Originals locally.