Power bi report server data refresh and incremental data Load from source

Hi,

I have power bi desktop and power bi report server(Trial Version). I would like to know how we can load only increment data from source Database table
to ours.PBIX Model.

How we can schedule increment data to refresh on power bi report server.

Problem Statment:- I have 15 SQL server table with millions of rows. I would import the data in .pbix file. After that, I would like to load only increment data.
and automate data refresh on power bi report server.