I have the same issue. I added the constant as you did to wp-config.php (as described on the plug-in’s ‘Constants’ help page, and even though the plugin’s ‘FAQ’ page I can see my new path displayed at the top, when I run a backup it still uses the default (plugin defined) path to store the backups. Also, as you are seeing, the backups list does not show any backups, as this is looking in your amended path.
This is clearly a bug in the plug-in which needs to be addressed by the developer. Unfortunately, I imagine the only way that will happen is to pay for support as the developer seems to have his own support site for this which you need to pay for here: https://fixedwp.com/backup-plugin/ (costs $23.99)
You should find your backup files in the default backup path which will be here:
/your/home/path/wp-content/backupwordpress-<GUID>-backups/
I hope the developer reads these post and fixes this!
For the developer: If the backup path is amended by inclusion of a const in wp-config.php in the format: define( ‘HMBKP_PATH’, ‘/home/xxxxxx/public_html/_backups’ );
no backups are written to the amended path, but remain being written to the plugin’s default path. The backups list however displays the backups found in the amended path so will never show any backups. Would be grateful if you would fix this issue.
Cheers, Paul