The Basics
WP Import Export plugin can synchronize your data between your multiple sites. with just few clicks
Step : 1 create schedule export
you need to add new folder or existing folder in wordpress upload directory.
File name will custom so it will replace old file every time.
Interval is frequency for synchronize your data. if interval is low then it may create load in your site. so it will large as possible.
Step : 2 create schedule Import
you have to import your data now. go to new import menu.
Choose upload from URL and give exported file URL. filtering data and map your fields.
In step 5 create click save schedule button for create new schedule import.