VSS Error (code: 2404)
Thanks for the reply.
I had followed the KB article before I posted, it made no difference for me.
Hunting around I found an article or two about unwanted VSS providers, following those seems to have fixed the issue, at least backups are running again.
Still pretty annoyed that last year I bought maintenance and got help from MSP360, this year they refused!! Having said that, I aprreciate your help.