Here are some instructions on how to do a manual backup of the database using MySQL from the website wpbeginner.com. It is very straight forward. You log into your service provider, go to MySQL, select your database, and Export it to a file. You don’t need to change any export settings. Save the file to your local computer. If you choose gzip as a file format you may need to get the program to unzip it.
You can use a plugin to backup WordPress also. You can use VaultPress, BackupBuddy, BackWPup, or WordPress backup to Dropbox. There are many others as well, however the popular site wpbeginner.com mentioned these in an article. The best is to do your research before selecting a method.
You can use a plugin to backup your WordPress site to various locations including Google Drive. This one is free.