any advantages, other than security with removing attack surface, when using iSCSI attached volumes from a NAS directly to the Windows MediaAgent rather then writing via SMB to the NAS share?
In regards of performance, ransomware protection etc?
Your thoughts are highly appreciated, thanks in advance
I would recommend to use SMB! Reason for it is because it allows you to really benefit from HA on recovery side. Other than that it depends on the kind of storage array behind it. The ransomware protection capabilities are applicable to both SMB and iSCSI (block) and most storage vendors are adding additional ransomware mitigating improvements on their side like snapshot eradication protection or file level monitoring.