How to schedule FTP download and then FTP upload, or FTP sync

Advice please - what should I be using for this ?

I have OMV running on a Raspberry Pi

version : 4.1.35-1

processor : ARMv7 Processor rev4(v71)

I need to do 2 processes :

Process 1 :

schedule ( say every 15 minutes ) :

Connect to an external / online FTP server ( requires Implicit FTP over TLS - I do have user and pass )

Sync the files ( or copy new files ) from the online FTP site to a folder on the external mounted drive connected to the Pi.

Process 2 :

schedule ( say every 15 minutes to run just after the Process 1 above ) :

Connect to an external / online FTP server ( I do have user and pass )

Sync the files from the folder on the external mounted drive connected to the Pi, to the online FTP site.

Would appreciate any pointers / info as to what plugins / addons / features I should be using for this.

Regards

update - decided better to set up a web server on the Pi, and run this in php