In my research I found two other people reporting 49’s when running backups after an update.

Both on older versions ( as far back as 3.5)

And both of they say that it just fixed itself.

Well…. Mine has just fixed its self.

I was testing at 4:00 pm and they failed with 49’s

At 4:30 pm they worked.

Upgrade some more servers and they worked.

I asked everybody I could if anything was done.

I have never been able to find a reason for getting the 49 return codes on those servers.

But they are working now