Cannot open backup device. Operating System error 5

Question

Below is the query that I am using to backup (create a .bak) my database.

However, whenever I run it, I always get this error message:

Answer 1

I was just going through this myself. I had ensured that my MSSQLSERVER login user had full access but it was still causing issues. It only worked once I moved the destination to the root of C. More importantly out of a user folder (even though I had a share with full permissions - even tried "Everyone" as a test).

I don't know if i consider my issue "fixed", however it is "working".

Just a FYI for any other users that come across this thread.