the screen shot is off your backup file.
Here's where you need to be checking the permissions:
cPanel
File Manager
select public_html
If you have your abantecart in a directory - select that directory
Then - open Admin, open system
Check the permissions on BACKUP - needs to be 777, if not -
Highlight backup (by clicking on it) select Change Permission from tool ribbon above, add check marks in the box until you have the permissions you need (takes all of them)-
It is not a setting within phpMyAdmin.