Access backups via FTP client?

Hi /etc/redhat-release:CentOS Linux release 7.6.1810 (Core) /usr/local/cpanel/version:11.78.0.12 /var/cpanel/envtype:standard CPANEL=release I have a 2nd hard disk - /dev/sdb1 - that is mounted as /backup (/dev/sdb1 on /backup type ext4 (rw,relatime,data=ordered)) I have created one directory per cPanel account on /backup as /backup/cpanel_username_backups I have changed the group and owner of the /backup/cpanel_username_backups directory to be that of the cpanel user, and it has permissions of rwxr-wr-w. I have created a symlink to the /backup/cpanel_username_backups directory in the cpanel users home directory as /home/cpanel_user/_backup and the link has permissions of lrwxrwxrwx and has group and owner of the cpanel user. If I set the SSH/Terminal settings to be a jailshell via WHM / Manage Shell Access then: an ls listing shown the _backups directory as white text on a red background and shows that is it a symlink to /backup/cpanel_username_backups. an attempt to cd into the _backups directory fails with a 'no permission' error. If I run a php script that writes to the _backups directory from the terminal, then I get a 'no permission' error. If I run the same php script from cron (with no SHELL= line), I get the same failure. Cron tasks that don't not need to write to the _backups directory run successfully. If I run the same php script from cron (with no SHELL="/bin/bash" line), I get the same failure. Cron tasks that don't not need to write to the _backups directory run successfully. If I run the same script from a browser session, then it works and a backup file is created. If I connect using an ftp client (FileZilla_), I can't cd into the _backups directory. If I set the SSH/Terminal settings to be a normal shell via WHM / Manage Shell Access then: an ls listing shown the _backups directory as a symlink to /backup/cpanel_username_backups. an attempt to cd into the _backups directory works and I can see all the files in that directory. If I run a php script that writes to the _backups directory, it succeeds. If I run the same script from cron (with no SHELL= line), it succeeds. If I run the same script from cron (with no SHELL="/bin/bash" line), it succeeds. If I run the same script from a browser session, then it works an a backup file is created. If I connect using an ftp client (FileZilla_), I can't cd into the __backups directory. So, how can I use a jailshell and still run cron jobs that need to write to the _backups directory? How can I get access to the _backups directory via an ftp client? Many thanks