Back-up of Fortianalyzer very slow

A customer runs FortiAnalyzer in our DC. Performance is good.
2 iSCSI disks iSCSI on 2 TruaNAS storage nodes (OS on SSD - 4GiB , DATA on Hybrid 7 TiB).

If we run a back-up of the OS disk (even on hybrid storage) it copies around 250MiB/s to the Synology NAS.
If we run a back-up of the DATA disk it copies around max 10MiB/s to the same NAS.

Various test show throughput to NAS to be sufficient, around 800MiB/s.
We've tried also without compression etc. but no luck in increase of speed.

Any ideas here?
 

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