To enhance the external storage on the M2 Mac Mini above the internal storage, a high-speed NVMe SSD in an enclosure is needed. In terms of enclosures, the Acasis TBU-405 model is recommended since it has a maximum transfer rate of 40 Gbps. The SSD being the Western Digital Black SN770 is quite cheap when considering its read and write speeds of 5150 mb/s. All in all, this setup has a possible speed of around 2750 mb/sec which is greater than the internal storage of the base model M2 Mac Mini.