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OWC Drive Dock for backup drives or extra storage.
USB 3.1 about $75
Thunderbolt 2 + USB about $240
New vs Seasoned Crucial M225 256GB
See review and specifications. Has no over-provisioning; consumer grade. It looked reasonable a year ago and performs well in general, but my very lightly used one (travel laptop) failed completely after eight months (test unit is a brand-new one).
I have used several M225 units of 128GB and 256GB capacity, and I can no longer recommend them: one failed completely, one degraded badly and never fully recovered, and the others were test units which also degraded quickly.
Performance brand-new and after seasoning
The Crucial M225 starts out looking decent though inconsistent. Note that the rated write speed of 220MB/sec is good only in virgin state: the very 2nd fill-volume (not shown) it drops by about 15%! This behavior is true for every Crucial M225 I’ve used (4 or 5 of them). I find this misleading marketing claim completely unacceptable and at odds with reality.
After seasoning , the M225 degrades severely for writes, right down to the speed of USB 2 (about 30MB/sec)! Egads. Even reads are impaired (“With read speeds up to 250MB/s...”), the weasel phrase being “up to”. This is a pathetic performance.
In the graph below, reads are green and writes are red. The heavier line is the seasoned result.