My Synology DS213+ was originally configured with 2 x Seagate 2TB ST2000DM001 drives. Macrium Reflect reported transfer speeds ranging from anything between 500Mb/s to 1Gb/s but averaged around the 850Mb/s mark.
I’ve recently rebuilt my lab and replaced the Seagate drives with 2 x WD 2TB Red drives in order to make the most of their 24x7\NAS capabilities.
Unfortunately the Macrium Reflect backup (same partition containing the same data) now hovers around the 520Mb/s transfer rate and never hits the same dizzy heights as when the Seagate drives were fitted in the DS213+.
I’m puzzled as to why the WD Red drives appear to be delivering lower performance.