The hard drive (memory) of the barebone is designed as an M.2 2280 NVMe PCIe 4.0 SSD and can be equipped with a capacity of 256 GB to 4 TB, depending on the model. Variants with 256 GB, 512 GB, 1 TB or 2 TB are installed as standard.
This model here comes with 1 TB.

The storage capacity can therefore be expanded by using an M.2 2280 NVMe PCIe 4.0 SSD with up to 4 TB. The device therefore supports a maximum SSD size of 4 TB in M.2 2280 format.