If you need a good WordPress backup solution, I highly recommend UpdraftPlus (free edition, the pro version is called UpdraftPlus Premium). If you have a problem where Updraft can’t crate the backup folder (red worded error message on the settings page, here’s what to do:
Login to your website with FTP or use the file manager in cPanel, and create the updraft folder inside the wp-content folder of your site.
Then, right click and select Permissions. This only worked when I changed it to 777, but that is somewhat insecure. It is something to try if you can’t get the backups working.