With the SQL Express version, it is not possible to set up a backup plan using SSMS.
There are many scripts on the Internet for performing a backup, in this tutorial I will explain how to put in backup plan with a SQL Backup Master that is available for free.
The installation of the software is very simple, I do not detail it in the article.
Creating a SQL Express backup plan
If the parameters are good, a message is displayed indicating that the connection is established, close the window by clicking OK, then validate the connection parameters by clicking OK. On the left side of the SBM the available databases are displayed, select the databases to be saved 1 and click on Add 2 to specify the location.
SQL Backup Master is an alternative to scripts to perform database backups in SQL Express by approaching a maintenance plan as one could do with SQL Server Management Studio.