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Buy a 1TB external USB-3 SSD. Attach to lid with velcro or double sticky tape. Hook it to your Mac with this https://www.amazon.com/dp/B0DL67PDJ8?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2&th=1. Move your photoslibrary file to the external. Open Photos by holding down the OPT key and select the file on your external drive. Make that the "system Photos Library". Make sure to check download originals and include the external drive in your backup scheme.