Solid NAS with slow backup on USB, despite USB 3.0

Solid NAS with slow backup on USB, despite USB 3.0

WD My Cloud EX2 Personal Cloud Storage (2-Bay) anthracite (Accessories)
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Customer Review

All in all, the NAS is running stable and does what it should, and I really use it as a pure NAS and all other services have been deactivated.

The only criticism after about 2 months is that the backup is slow at USB. Although I have a USB 3.0 connected hard drive and want to copy only about 150 GB requires that several hours. Background is probably that copying via rsync runs and this is the CPU consistently above 90%. (Firmware 1:05:30)

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