Slow backup SSD to HDD with DD on Raspberry Pi 4B (OMV 5.6.6-1)

  • Hi, I configured backup on my Pi with OMV, but it's very slow. Normally files write on this HDD with speed 100MB/s (SMB or SSD to HDD copy) but DD creates backup with speed 7.4MB/s. Is it normal?

    Also when I run backup with cron it takes 100% cpu and can't do anything on device.

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