I pose the question in the subject line as portable SSDs for data storage or backups are pretty expensive in larger capacities. A cheaper option and in my opinion just as good is to buy an SSD in either 2.5 inch or NVMe form factor, get an enclosure which are cheap as chips, pop in your chosen SSD and your good to go. This may not be as small and attractive as say a Samsung T5 but will do just as good a job and in NVMe form do it even faster.