I'd just get a good internal nvme drive and put it in an enclosure.
Data Hoarder
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I use OWC (Envoy, FX) with my own NVMe Drive, Samsung T7, Crucial X9/x10 and they’re all fine.
What is "OWC (Envoy, FX)"? Is that a hard drive or a case? I looked up the website but it seems rather expensive being more than double the cost of SandDisk. I appreciate that I might need to pay more for better quality but I was hoping to find a similar equivalent but alternative to the SanDisk without the widespread issues.
Thunderbolt enclosure since i work on video and photography. I need the bandwidth.
Had zero issues with OWC overall and I’ve used many of their products for production, travel, and capture.
With SanDisk it's taking around 8hours to backup 1TB.
That isn't because of the SanDisk, I have Samsung spinning drive (yes they were making that) that's 15 years old or more, over USB2 and it's faster than that.
Get a Samsung T7 or whatever Samsung SSD they have now, but one with metal case not the rubbish rubber ones. Or DIY if you want it slightly cheaper and to pick yourself the SSD and the enclosure.