i had a issue where my vSphere Data Recovery backups would not start, each time they displayed the error -3948 VCB API Exception. Not exactly a clear error message to go at.
I then noted that I had made changes to my internal DNS and the internal DNS server the appliance was using we no longer in service and this error is really a DNS server to say I cannot find any host names for the ESXi Servers.
I changed the DNS in the appliance via the console and then the update allowed the backups to start correctly.
thank you ver much for posting this. it solves my problem
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