TimeMachineBackup works intermittently

My Cloud OS 5 Personal & Network Attached Storage My Cloud EX Series
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@WDStaff @SBrown Could you please look into my case number 210205-000710 ?

Support team is really talking non sense. Now they pretend that the NAS is using SMB on it’s side and my Macs AFP on their side… can share the quotation if you wanna.