I’m a HUGE fan of Macrium Reflect. Available in both free and for-a-fee forms, I’m convinced it’s the best Windows image backup tool available today. Disclosure: I run both free and fee-based versions, and own a Home 4-Pack license that I upgrade as new versions are released. I was reminded to choose Reflect backup drives carefully yesterday, when I targeted an older USB 3 drive with mSATA SSD devices under its hood. Let me explain…

Why Say: Choose Reflect Backup Drives Carefully?

Because the read and write speeds of the underlying device and the speed of the channel (USB 3.1 in my case here) matter. In fact, they strongly affect the time it takes to complete a whole-image backup. In targeting an mSATA device that backup took nearly 40 minutes to complete.

I’m making the same backup right now, and targeting a PCIe x3 NVMe SSD in a Sabrent USB-C enclosure right now. As you can see from the lead-in graphic, Macrium Reflect currently guesstimates it will take 19 minutes to complete. That’s just over 50% faster than the mSATA number, or about 20 minutes overall.

If such a task is running in the background, and can complete whenever it’s done, that doesn’t matter much. But if, as in my case, I was waiting on completion to do something else, it matters a lot.

And There’s More…

While watching the NVMe and mSATA image backups proceed, I noticed another difference. The transfer rate for the two backups not only differed but so did their variability. The NVMe device kept getting faster as it proceeded. It ranged from a low of 1.1 Gbps to a high of 1.8 Gbps. The mSATA device started out at around 600 Mbps, It dropped as low as 220 Mbps, and as high as 1.0 Gbps during the course of the backup process.

Upon completion, Reflect also shared other stats worth noting. The overall read rate for the mSATA device was reported at 1.6 Gbps, while its write rate came in at a less stellar 550 Mbps. On the NVMe device, the overall read rate was 6.6 Gbps, and the write rate 1.9 Gbps. That’s a BIG difference, and explains the title for this story. Yes, these numbers appear inflated because they take compression into account. But those are the numbers that Reflect reports, and they do underscore the importance of device read/write speeds.

Note: Actual time for the NVMe backup was 19:31, while actual time for the mSATA backup was 39:52.