Hello,
Are you backing up "OPEN" files?
Are you getting exceptions in the job logs?
As per your example, you are backing up SQL Database file which is a open file.
1 : Backup Exec will not backup open files, unless and until you install Advance Open file Option
2 : AOFO is a License option in BE 9.x, 10.x and 11.x
3 : Try backing up a folder which contains FLAT files.