How to restore data on existing database

my one localmachine have erpnext version 8 and another local machine uses erpnext old version . now i want to restore my all data have (erpnext version 8) on pc to another pc (erpnext old pc)

it is not possible to restore the data on existing database, instead you can import your data from Old ERPNext site using Data Import Tool and export the Same csv data to your New ERPNext Site.

ok , thanks … data import tool system is time consume .