Don't you think, partitioning the backup would be help to reduce the backup time?

The log description is just a few words:

event 17055

Serverity level 26

and a link to Microsoft website, but it's an invalid link once clicked.

Startup account changed? I don't think so, since...

It works. Thank you, Ray.

Vincent.

That's the point where I think MS SQL is convenient, but dangerous.

I learned the lesson.

Thanks, SQLBill.