@SSCertifiable:

Can you explain further? I am not a SQL Server expert. I know some tsql but I'm still at beginning level. Note that I did not use any tsql command why performing the above operations. I only used GUI.

Why didn't I create a regular tsql backup? Because it is simpler to copy and paste the files than running a tsql command. The person who works with me does not know anything about sql. That's the way she backs up sql database.