https://help.tallysolutions.com/docs/te9rel64/sync/Synchronisation_Via_Private_Network_Intro.htm

Synchronisation via Private Network - Introduction

When online synchronisation is performed on a private network, data is sent or received using internet or LAN. Your computer needs to be connected to the Internet or LAN to perform synchronisation.

To know more, click the following links:

Configuring Client/Server

Creating Sync Rule on Client

Activating Sync Rule on Server

Synchronising Data