Note that from vTiger 6.0 onwards i.e. 6.5 and 7+ there is no default backup module. You’ll either have to buy a commercial module or roll your own script. The guide below will be obsolete.
I use the vTiger CRM product and it has a unusual quirk with enabling backups. Whilst the user interface (CRM settings -> Backup server) has check boxes to enable local and FTP backup the script actually tries to alter the following file, /user_privileges/enable_backup.php and in that set the two flags to a value of either true or false,
$enable_local_backup = 'true'; $enable_ftp_backup = 'false';
As the script has no permissions to do that then it gets a fopen() permission error (Warning: fopen(/*****/user_privileges/enable_backup.php): failed to open stream: Permission denied in /****/modules/Settings/SaveEnableBackup.php on line 43) and so when the ajax refreshes the screen it looks as if nothing has been done.
Without messing with your directory permissions then you can edit the /user_privileges/enable_backup.php manually.
Even if you manage to get the directory details into the local backup it will not work unless that enable local backup flag is set to true. It will say that it has done a backup but it will not save any file.