Western Digital and SanDisk (both brands belong to the same group) now offer external SSDs with up to 4 TB of capacity.
The cheapest option to get this much storage is the My Passport SSD from Western Digital. The SanDisk Extreme Portable SSD v2 is a bit more expensive, and both are around 700 Euros. Again a bit more expensive is WD_BLACK P50 Game Drive SSD called SSD under the label of Western Digital and the most expensive variant is the SanDisk Extreme PRO® Portable SSD V2. The differences are mainly in the speed and interface of the aforementioned SSDs, with the SanDisk is added that the housing is somewhat more stable.
- My Passport SSD – around 1000 MB/s, USB-C 10 Gbit/s
- SanDisk Extreme Portable SSD v2 – around 1000 MB/s, USB-C 10 Gbit/s
- WD_BLACK P50 Game Drive SSD – by 2000 MB/s, USB-C 20 Gbit/s (USB 3.2 Gen 2×2)
- SanDisk Extreme PRO® Portable SSD V2 – around 2000 MB/s, USB-C 20 Gbit/s (USB 3.2 Gen 2×2)
Since the SSDs all rely on USB ports, they of course also run older and slower ports, then just with reduced speed. Compared to Thunderbolt-based models, however, you have a slightly better flexibility.